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Icon-buildThis article is about a rider form used by several identities in Kamen Rider Build.
KRBu-Buildrabbittank

Kamen Rider Build

Kamen Rider Build (仮面ライダービルド, Kamen Raidā Birudo) may refer to one of the following characters.

Quick Answers

What is the significance of the Rabbit Tank form in Kamen Rider Build? toggle section
RabbitTank form is a primary transformation of Kamen Rider Build, achieved through Fullbottles. It has multiple variations like the RabbitTank Sparkling Form and the RabbitTank Hazard Form, each possessing distinctive finishes. This form is prominently featured across several episodes and exclusive spin-off installments.
Provided by: Fandom
What is the Build Driver's role in Kamen Rider Build's transformation? toggle section
The Build Driver, a transformation device, is central to Kamen Rider Build's transformation process. Developed as part of Project Build, it uses Fullbottles for transformation, requiring a Hazard Level of 3. Created by Sento Kiryu, also known as Takumi Katsuragi, the Build Driver is based on the Evol-Driver. Besides Kamen Rider Build, it is also utilized by Kamen Riders Cross-Z, Grease, Prime Rogue, Blood, Killbus, and Metal Build.
Provided by: Fandom
How does the Build Genius form enhance Kamen Rider Build's abilities? toggle section
Build Genius form boosts Kamen Rider Build's capabilities by enabling access to the Build Form, armed with the Drill Crusher. The form is linked to his transformation belt, the Build Driver. In this form, he can release a green energy slash and discharge a rainbow energy ball, causing shockwaves. The intensity of his attacks fluctuates with his emotions, a feature of the Build Driver's Hazard Level.
Provided by: Fandom
What is the function of the Kamen Rider Build belt? toggle section
The Build Driver, or Kamen Rider Build belt, is a transformation tool used by Kamen Rider Build. It enables the user to transform into various forms, such as the Build Genius Form. The belt is also outfitted with the Drill Crusher.
Provided by: Fandom
What is the concept behind the 'best build' in Kamen Rider Build? toggle section
The 'best build' in Kamen Rider Build is a transformation concept where the protagonist combines two Fullbottles, each symbolizing a different aspect or element, to form 'Best Match' forms. These forms, designed for optimal effectiveness in various situations, include HawkGatling, NinninComic, RocketPanda, and several others.
Provided by: Fandom

Hologram[]

After completing the Build Driver's construction, Takumi Katsuragi then did a video demonstration of his experiments on a secret computer file record, including a holographic combat simulation of Build's capabilities and showing its possibly limitless form changing potential. He show hologram Build as Rabbit Tank Form to defeat two Guardians.

Holograms of Build RabbitTank Hazard Form and Build RabbitTank Sparkling Form (off-screen) were used by Nariaki Utsumi in a trial test for Clone Hell Bro's.[Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Final Chapter]

Forms[]

To transform into Kamen Rider Build, a user sets two different Fullbottles into the Build Driver and turns the crank. Kamen Rider Build, like Kamen Riders Double and OOO before him, can assume a variety of different forms, called Trial Forms (トライアルフォーム, Toraiaru Fōmu), using different combinations of Fullbottles. However, each one has a Best Match (ベストマッチ, Besuto Matchi) with another Fullbottle that creates an especially powerful form. Best Matches usually have unique names in comparison to other mismatched forms, and the caps of Fullbottles indicate what Fullbottle is its Best Match. The additional use of the Hazard Trigger upgrades a Best Match into a Super Best Match (スーパベストマッチ, Supā Besuto Matchi).

Build initiates a finishing attack by turning the Build Driver's Vortex Lever again. The finisher of all Trial Forms is called the Vortex Attack (ボルテックアタック, Borutekku Atakku), while the finisher of the Best Matches is called the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu). The finisher of the Super Best Matches is called the Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu).

In any form that uses the Rabbit Fullbottle, Build is armed with the Rabbit Foot Shoes (ラビットフットシューズ, Rabitto Futto Shūzu) on his left leg for increased jumping.

RabbitTank Form
KRBu-Buildrabbittank

RabbitTank Form

"Rabbit! Tank! Best Match! Are you ready? (Techno rock music) Hagane no moonsault! RabbitTank! Yeah!"
―RabbitTank's transformation announcement[src]
Rider Statistics[1][2][3]
  • Rider Height: 196 cm
  • Rider Weight: 99 kg
Ability Parameters (Standard → Prototype)[1][2][3]
  • Punching Power: 9.9 t → 14.7 t (right arm)/17 t → 25.2 t (left arm)
  • Kicking Power: 23.7 t → 35.1 t (right leg)/17.8 t → 26.3 t (left leg)
  • Maximum Jump Height: 55 m → 71.5 m
  • Maximum Running Speed: 100 m per 2.9 seconds → 1.9 seconds

RabbitTank Form (ラビットタンクフォーム, Rabitto Tanku Fōmu) is Build's red and blue primary and default Best Match form form accessed from the Rabbit and Tank Fullbottles, hence known as the Moonsault of Steel (鋼のムーンサルト, Hagane no Mūnsaruto). It is a Touto Best Match, and is themed after a rabbit and a tank.

Being Build's most balanced (and second fastest) form, RabbitTank is the Best Match form favored by Kamen Rider Build, despite being able to transform with any Fullbottles. The Rabbit and Tank Fullbottles are noted as having a particularly high synergy with each other and compatibility with various mechanisms, thus RabbitTank is the basis of several upgraded forms Build can access.

In this Best Match form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat surface.

This form's weapon is the Drill Crusher. In the final episode, Build uses the Fullbottle Buster while in this form.

RabbitTank Form consists of the following parts
  • BLD RabbitTank Head (BLDラビットタンクヘッド, BLD Rabitto Tanku Heddo)
    • Panzer Head Armor (パンツァーヘッドアーマー, Pantsā Heddo Āmā)
    • Wild Head Armor (ワイルドヘッドアーマー, Wairudo Heddo Āmā)
    • Canon Face Module (キャノンフェイスモジュール, Kyanon Feisu Mojūru)
    • Ear Face Module (イヤーフェイスモジュール, Iyā Feisu Mojūru)
    • BLD Signal (BLDシグナル, BLD Shigunaru)
    • Right Eye Tank (ライトアイタンク, Raito Ai Tanku)
    • Left Eye Rabbit (レフトアイラビット, Refuto Ai Rabitto)
  • Wild Chest Armor (ワイルドチェストアーマー, Wairudo Chesuto Āmā)
  • Panzer Chest Armor (パンツァーチェストアーマー, Pantsā Chesuto Āmā)
  • BLD Rapid Shoulder (BLDラピッドショルダー, BLD Rapiddo Shorudā)
  • BLD Impact Shoulder (BLDインパクトショルダー, BLD Inpakuto Shorudā)
  • Quick Rush Arm (クイックラッシュアーム, Kuikku Rasshu Āmu)
  • BLD Rapid Glove (BLDラピッドグローブ, BLD Rapiddo Gurōbu)
  • Heavy Assault Arm (ヘビーアサルトアーム, Hebī Asaruto Āmu)
  • BLD Impact Glove (BLDインパクトグローブ, BLD Inpakuto Gurōbu)
  • Heavy Assault Leg (ヘビーアサルトレッグ, Hebī Asaruto Reggu)
  • Quick Rush Leg (クイックラッシュレッグ, Kuikku Rasshu Reggu)
  • Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu)
  • Rabbit Foot Shoes (ラビットフットシューズ, Rabitto Futto Shūzu)
Build Driver finisher
  • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu), which has two variations:
    • Build dives underground to send a white energy chart flying up to the surface with the dotted line securing the enemy before leaping back up, and delivering a kick whilst riding the chart's line. According to Blood Stalk, this finisher has a Hazard Level of 3.2, and then 3.7 when Build attacks him out of anger.
    • Build performs a jumping roundhouse kick covered in red and blue energy.
Drill Crusher finisher
  • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
    • Blade Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
      • Biotic:
        • Rabbit: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a red energy slash.
        • Gorilla: The Drill Spiral Blade cloaks itself in an energy projection that bears a striking resemblance to the Muscle Glove.
        • Ninjya: Purple energy Drill Spiral Blades are projected and spin violently around the Drill Crusher.
      • Abiotic:
        • Rocket: The Drill Crusher charges at the enemy and attacks like a rocket.
    • Gun Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful blast.
      • Harinezumi: Build shoots white energy spikes at the enemy.
Fullbottle Buster finisher
  • Just Match Break (ジャストマッチブレイク, Jasuto Matchi Bureiku): Build channels the power of two Fullbottles for a powerful attack.
    • Buster Blade Mode
      • Gold Rabbit + Silver Dragon: Build jumps into the air and performs a powerful downward slash covered in gold and silver energy, followed by two horizontal slashes.
Appearances: Ex-Aid Episode 44, True Ending, Build Episodes 1-2, Transformation Lessons: Kamen Rider Build Chapter, Build 3, 5-7, 9-10, 13 (flashback), 14, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15-17, Birth! KumaTV!! VS Kamen Rider Grease!, Build 21-25, 30, 42-43, Be The One, Build 49, Zi-O Episodes 1-2, Heisei Generations FOREVER

RabbitSoujiki Form
KRBu-Buildrabbitsoujiki

RabbitSoujiki Form

"Rabbit! Soujiki! Are you ready? (Funky music)"
―RabbitSoujiki's transformation announcement[src]
Rider Statistics[4][5]
  • Rider Height: 196 cm
  • Rider Weight: 93.7 kg
Ability Parameters[4][5]
  • Punching Power: 7.9 t (right arm)/5.7 t (left arm)
  • Kicking Power: 9.6 t (right leg)/14.2 t (left leg)
  • Maximum Jump Height: 38.4 m
  • Maximum Running Speed: 100 m per 3.9 seconds

RabbitSoujiki Form (ラビット掃除機フォーム, Rabitto Sōjiki Fōmu) is Build's red and turquoise Trial Form accessed through the Rabbit and Soujiki Fullbottles, themed after a rabbit and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This Trial Form gives Build the ability to absorb any elemental attacks using the Long Range Cleaner, and safely disarm the accumulated attack using the Trash Converter. However, this comes at the cost of all of his Ability Parameters being decreased from RabbitTank.

RabbitSoujiki Form consists of the following parts
  • BLD RabbitSoujiki Head (BLDラビット掃除機ヘッド, BLD Rabitto Tanku Heddo)
    • Clean Head Armor (クリーンヘッドアーマー, Kurīn Heddo Āmā)
    • Wild Head Armor (ワイルドヘッドアーマー, Wairudo Heddo Āmā)
    • Cleaner Face Module (クリーナーフェイスモジュール, Kurīnā Feisu Mojūru)
    • Ear Face Module (イヤーフェイスモジュール, Iyā Feisu Mojūru)
    • BLD Signal (BLDシグナル, BLD Shigunaru)
    • Right Eye Cleaner (ライトアイクリーナー, Raito Ai Kurīnā)
    • Left Eye Rabbit (レフトアイラビット, Refuto Ai Rabitto)
  • Wild Chest Armor (ワイルドチェストアーマー, Wairudo Chesuto Āmā)
  • Clean Chest Armor (クリーンチェストアーマー, Kurīn Chesuto Āmā)
  • BLD Rapid Shoulder (BLDラピッドショルダー, BLD Rapiddo Shorudā)
  • Trash Converter (トラッシュコンバーター, Torasshu Konbātā)
  • Quick Rush Arm (クイックラッシュアーム, Kuikku Rasshu Āmu)
  • BLD Rapid Glove (BLDラピッドグローブ, BLD Rapiddo Gurōbu)
  • Sterilize Arm (ステリライズアーム, Suteriraizu Āmu)
  • Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā)
  • Sterilize Leg (ステリライズレッグ, Suteriraizu Reggu)
  • Quick Rush Leg (クイックラッシュレッグ, Kuikku Rasshu Reggu)
  • Hygienic Shoes (ハイジェニックシューズ, Haijenikku Shūzu)
  • Rabbit Foot Shoes (ラビットフットシューズ, Rabitto Futto Shūzu)

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 2

RabbitGatling Form
KRBu-Buildrabbitgatling

RabbitGatling Form

"Rabbit! Gatling! Are you ready? (Funky music)"
―RabbitGatling's transformation announcement[src]
Rider Statistics[6][7]
  • Rider Height: 196 cm
  • Rider Weight: 95 kg
Ability Parameters[6][7]
  • Punching Power: 7.9 t (right arm)/8 t (left arm)
  • Kicking Power: 10.8 t (right leg)/14.2 t (left leg)
  • Maximum Jump Height: 37.7 m
  • Maximum Running Speed: 100 m per 6.2 seconds

RabbitGatling Form (ラビットガトリングフォーム, Rabitto Gatoringu Fōmu) is Build's red and gray Trial Form accessed through the Rabbit and Gatling Fullbottles, themed after a rabbit and a gatling gun.

In this Trial Form, Build is armed with the Hawk Gatlinger and Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 4

Trial Forms
"Rabbit! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Gorilla Fullbottle, Build is armed with the Muscle Glove (マッスルグローブ, Massuru Gurōbu) on his right arm for enhanced punching.

GorillaMond Form
KRBu-Buildgorillamond

GorillaMond Form

"Gorilla! Diamond! Best Match! Are you ready? (Tropical rock music) Kagayaki no destroyer! GorillaMond! Yeah!"
―GorillaMond's transformation announcement[src]
Rider Statistics[8][9]
  • Rider Height: 189 cm
  • Rider Weight: 112 kg
Ability Parameters[8][9]
  • Punching Power: 25.9 t (right arm)/15.8 t (left arm)
  • Kicking Power: 17.3 t (right leg)/16.5 t (left leg)
  • Maximum Jump Height: 32.5 m
  • Maximum Running Speed: 100 m per 8.4 seconds

GorillaMond Form (ゴリラモンドフォーム, Goriramondo Fōmu) is Build's brown and cyan second Best Match form accessed from the Gorilla and Diamond Fullbottles, hence known as the Shining Destroyer (輝きのデストロヤー, Kagayaki no Desutoroyā). It is a Touto Best Match, and is themed after a gorilla and a diamond.

In this Best Match form, Build is armed with the BLD Prism Glove (BLDプリズムグローブ, BLD Purizumu Gurōbu) on his left hand.

GorillaMond shows an increase in power, as the Punching Power of Build is significantly higher than in RabbitTank, albeit with a slightly decreased amount in its left arm, but it lacks Kicking Power and agility compared to RabbitTank. The BLD Muscle Glove can greatly damage enemies, and in rare cases can outright destroy them in one punch, and can even damage steel beams. On top of that, the Saddon Destroyer (サドンデストロイヤー, Sadon Desutoroiyā) arm unit it is attached to can utilise explosive force to double the damage dealt.

His left arm can convert abiotic objects, or even weakened enemies, into diamonds. On top of that, the BLD Prism Shoulder (BLDプリズムショルダー, BLD Purizumu Shorudā) can create miniature light barrier shields to stop energy attacks.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): This finisher has three variations:

  • Build uses the BLD Prism Glove to create a gust full of diamonds and uses the Muscle Glove to punch them at the enemy. The diamonds creates a tornado that causes a human to separate from his/her Smash form, then Build punches the Smash inside the tornado, destroying it.
  • Build stops an enemy's projectile attack in mid-air with the BLD Prism Glove, altering the projectile's atomic structure into a diamond shield. He then punches the shield with the Muscle Glove, shattering it and sending the shards flying at the enemy at high speeds.
  • Build uses the BLD Prism Glove to create a pile of diamonds, then punches it with the Muscle Glove, sending the diamonds flying at the enemy.
Appearances: Ex-Aid Episode 44, True Ending, Build Episode 2, Transformation Lessons: Kamen Rider Build Chapter, Build 3-4, 6

GorillaSoujiki Form
KRBu-Buildgorillasoujiki

GorillaSoujiki Form

"Gorilla! Soujiki! Are you ready? (Funky music)"
―GorillaSoujiki's transformation announcement[src]
Rider Statistics[10][11]
  • Rider Height: 189 cm
  • Rider Weight: 111.7 kg
Ability Parameters[10][11]
  • Punching Power: 20.7 t (right arm)/5.7 t (left arm)
  • Kicking Power: 9.6 t (right leg)/13.2 t (left leg)
  • Maximum Jump Height: 26.5 m
  • Maximum Running Speed: 100 m per 6.2 seconds

GorillaSoujiki Form (ゴリラ掃除機フォーム, Gorira Sōjiki Fōmu) is Build's brown and turquoise Trial Form accessed through the Gorilla and Soujiki Fullbottles, themed after a gorilla and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 3

GorillaRocket Form
KRBu-Buildgorillarocket

GorillaRocket Form

"Gorilla! Rocket! Are you ready? (Funky music)"
―GorillaRocket's transformation announcement[src]
Rider Statistics[12][13]
  • Rider Height: 189 cm
  • Rider Weight: 115 kg
Ability Parameters[12][13]
  • Punching Power: 20.7 t (right arm)/11.6 t (left arm)
  • Kicking Power: 13.5 t (right leg)/13.2 t (left leg)
  • Maximum Jump Height: 32.5 m
  • Maximum Running Speed: 100 m per 9.1 seconds

GorillaRocket Form (ゴリラロケットフォーム, Gorira Roketto Fōmu) is Build's brown and light blue Trial Form accessed through the Gorilla and Rocket Fullbottles, themed after a gorilla and a rocket.

In this Trial Form, Build is armed with the Space Ride Arm (スペースライドアーム, Supēsu Raido Āmu) on his left arm that can fly off as a rocket and ram the opponent, and let him fly.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 8

Trial Forms
"Gorilla! (Abiotic Fullbottle name)! Are you ready?"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Taka Fullbottle, Build is armed with the Celestial Wings (ソレスタルウィング, Soresutaru Wingu) on his back that grant him the ability to fly, along with the Hawk Gatlinger.

HawkGatling Form
KRBu-Buildhawkgatling

HawkGatling Form

Kamen Rider Build HawkGatling Form (Extended Wings)

Extended wings

"Taka! Gatling! Best Match! Are you ready? (Brass band music) Tenkuu no abarenbou! HawkGatling! Yeah!"
―HawkGatling's transformation announcement[src]
Rider Statistics[14][15][16]
  • Rider Height: 193 cm
  • Rider Weight: 107 kg
Ability Parameters (Standard → Prototype)[14][15][16]
  • Punching Power: 9.7 t → 14.4 t (right arm)/10 t → 14.8 t (left arm)
  • Kicking Power: 13.5 t → 20 t (right leg)/14.2 t → 21.0 t (left leg)
  • Maximum Jump Height: 41.7 m → 54.2 m
  • Maximum Running Speed: 100 m per 5.8 seconds → 3.9 seconds

HawkGatling Form (ホークガトリングフォーム, Hōku Gatoringu Fōmu) is Build's orange and gray Best Match form accessed with the Taka and Gatling Fullbottles, hence known as the Rampage of the Skies (天空の暴れん坊, Tenkū no Abarenbō). It is a Touto Best Match, and is themed after a hawk and a gatling gun.

While this Best Match has low stats compared to RabbitTank, this is made up for by the Celestial Wings on his back which grant him flight capabilities, as well as the utilization of the Gatling Fullbottle's Hawk Gatlinger that was designed for this particular Best Match.

Build Driver finishers
  • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).
  • Hawk Gatlinger finisher:
  • Full Bullet (フルブレット, Furu Buretto): Build spins the Revol-Magazine ten times causing the gun to surround itself and its wielder with a white energy spherical graph that traps all enemies in mid-air before firing upon them all.
Appearances: Build Episodes 3-5, 8-10, 13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 16, 20, 24, 43, 49 (flashback; archive footage only)

Trial Forms
"Taka! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Ninjya Fullbottle, Build wields the 4Koma Ninpoutou. It also grants Build the Onmitsu Scarf (オンミツスカーフ, Onmitsu Sukāfu) on the right side of his back.

NinninComic Form
KRBu-Buildninnincomic

NinninComic Form

"Ninjya! Comic! Best Match! Are you ready? (Surfer rock music) Shinobi no entertainer! NinninComic! Yeah!"
―NinninComic's transformation announcement[src]
Rider Statistics[17][18][19]
  • Rider Height: 194 cm
  • Rider Weight: 90.5 kg
Ability Parameters (Standard → Prototype)[17][18][19]
  • Punching Power: 11.1 t → 16.4 t (right arm)/8.8 t → 13 t (left arm)
  • Kicking Power: 10.1 t → 14.9 t (right leg)/22.2 t → 32.9 t (left leg)
  • Maximum Jump Height: 45.4 m → 59 m
  • Maximum Running Speed: 100m per 4.2 seconds → 2.8 seconds

NinninComic Form (ニンニンコミックフォーム, Ninnin Komikku Fōmu) is Build's purple and yellow Best Match form accessed with the Ninjya and Comic Fullbottles, hence known as the Stealthy Entertainer (忍びのエンターテイナー, Shinobi no Entāteinā). It is a Touto Best Match, and is themed after a ninja and a comic book.

This form grants Build well-balanced abilities akin of RabbitTank. Furthermore, it has increased kicking and punching power with the cost of jumping power and speed. The 4Koma Ninpoutou was designed for this particular Best Match. This is also Build's fourth fastest form.

Additionally, thanks to the stretchable Onmitsu Scarf, Build can wrap his entire body in it to camoflauge himself with local scenery, rendering him almost invisible.

Build Driver finisher
  • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu)
4Koma Ninpoutou finishers
  • Clone Jutsu (分身の術, Bunshin no Jutsu, Art of Cloning): Build presses the Vortex Trigger one time and creates a number of clones of himself that attack together.
  • Fire Jutsu (火遁の術, Katon no Jutsu, Art of Fire Releasing): Build presses the Vortex Trigger two times and delivers a flaming slash attack. While performing this attack, the 4Koma Ninpoutou announces Blazing Slash (火炎斬り, Kaen Giri).
  • Wind Jutsu (風遁の術, Fūton no Jutsu, Art of Wind Releasing): Build presses the Vortex Trigger three times and creates a tornado around the blade. While performing this attack, the 4Koma Ninpoutou announces Tornado Slash (竜巻斬り, Tatsumaki Giri).
  • Stealth Jutsu (隠れ身の術, Kakuremi no Jutsu, Art of Camouflage): Build presses the Vortex Trigger four times and teleports a short distance away in a puff of smoke. While performing this attack, the 4Koma Ninpoutou announces Doron (ドロン, Doron, lit. "Abscond"), with a heavy drumbeat when he disappears and reappears.
Appearances: Build Episodes 5-7, 9, 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders[20], Build 16, Birth! KumaTV!! VS Kamen Rider Grease!, Build 20, 42 (off-screen), 43-44

NinjyaTank Form
KRBu-Buildninjyatank

NinjyaTank Form

"Ninjya! Tank! Are you ready? (Funky music)"
―NinjyaTank's transformation announcement[src]
Rider Statistics[21][22]
  • Rider Height: 194 cm
  • Rider Weight: 101.1 kg
Ability Parameters[21][22]
  • Punching Power: 8.9 t (right arm)/13.6 t (left arm)
  • Kicking Power: 19 t (right leg)/17.8 t (left leg)
  • Maximum Jump Height: 32.3 m
  • Maximum Running Speed: 100 m per 2.3 seconds

NinjyaTank Form (忍者タンクフォーム, Ninja Tanku Fōmu) is Build's purple and blue Trial Form accessed through the Ninjya and Tank Fullbottles, themed after a ninja and a tank.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot, as well as the Drill Crusher.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 6

Trial Forms
"Ninjya! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Panda Fullbottle, Build is armed with the Giant Scratcher (ジャイアントスクラッチャー, Jaianto Sukuracchā) claws on his right hand.

RocketPanda Form
KRBu-Buildrocketpanda

RocketPanda Form

"Panda! Rocket! Best Match! Are you ready? (Orchestra music) Buttobi monotone! RocketPanda! Yeah!"
―RocketPanda's transformation announcement[src]
Rider Statistics[23][24]
  • Rider Height: 189 cm
  • Rider Weight: 114 kg
Ability Parameters[23][24]
  • Punching Power: 18.8 t (right arm)/14.5 t (left arm)
  • Kicking Power: 16.9 t (right leg)/15.4 t (left leg)
  • Maximum Jump Height: 43.6 m
  • Maximum Running Speed: 100 m per 8.5 seconds

RocketPanda Form (ロケットパンダフォーム, Roketto Panda Fōmu) is Build's snow white and light blue Best Match form accessed with the Rocket and Panda Fullbottles, hence known as the Flying Monotone (ぶっ飛びモノトーン, Buttobi Monotōn). It is a Touto Best Match, and is themed after a panda and a rocket.

In this Best Match form, Build is armed with the Space Ride Arm (スペースライドアーム, Supēsu Raido Āmu) and the BLD Rocket Shoulder (BLDロケットショルダー, BLD Roketto Shorudā) on his left arm Both can combine and fly off the arm as into the Cosmo Builder (コスモビルダー, Kosumo Birudā) rocket to ram the opponent/ Additionally, the Space Ride Arm grants Build to fly long distances.

The Giant Scratcher is supported by the Giant Arm (Jaianto Āmu) power assist unit which can greatly increase the Giant Scratcher's strength.

This form grants Build a balanced boost in punching, kicking and jumping power, albeit his speed is the slowest of all forms so far. However, this issue is rendered null when he takes off into the air.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build surrounds the enemy with a white, oval-shaped energy chart, then uses the Space Ride Arm to fly at the enemy and performs a series of slashes with the Giant Scratcher. The chart goes up as Build continues to slash the enemy.

Appearances: Build Episode 7-8, 15, 18, 20

PandaGatling Form
KRBu-Buildpandagatling

PandaGatling Form

"Panda! Gatling! Are you ready? (Funky music)"
―PandaGatling's transformation announcement[src]
Rider Statistics[25][26]
  • Rider Height: 189 cm
  • Rider Weight: 112 kg
Ability Parameters[25][26]
  • Punching Power: 15 t (right arm)/8 t (left arm)
  • Kicking Power: 10.8 t (right leg)/12.3 t (left leg)
  • Maximum Jump Height: 26.6 m
  • Maximum Running Speed: 100 m per 8.6 seconds

PandaGatling Form (パンダガトリングフォーム, Panda Gatoringu Fōmu) is Build's snow white and gray Trial Form accessed through the Panda and Gatling Fullbottles, themed after a panda bear and a gatling gun. In this Trial Form, Build is armed with the Hawk Gatlinger.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 7

Trial Forms
"Panda! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Harinezumi Fullbottle, Build is armed with the BLD Spine Knuckle (BLDスパインナックル, BLD Supain Nakkuru) on his right fist, allowing him to clobber foes with spikes that extend outwards when used, and the BLD Spine Shoulder (BLDスパインショルダー, BLD Supain Shorudā), which can injure enemies in close combat.

FireHedgehog Form
KRBu-Buildfirehedgehog

FireHedgehog Form

"Harinezumi! Syoubousya! Best Match! Are you ready? (Rock music with sirens) Rescue kenzan! FireHedgehog! Yeah!"
―FireHedgehog's transformation announcement[src]
Rider Statistics[27][28]
  • Rider Height: 190 cm
  • Rider Weight: 103.7 kg
Ability Parameters[27][28]
  • Punching Power: 13.7 t (right arm)/11.9 t (left arm)
  • Kicking Power: 14.7 t (right leg)/14 t (left leg)
  • Maximum Jump Height: 36.5 m
  • Maximum Running Speed: 100 m per 6.4 seconds

FireHedgehog Form (ファイヤヘッジホッグフォーム, Faiya Hejjihoggu Fōmu) is Build's white and scarlet-colored Best Match form accessed from the Harinezumi and Syoubousya Fullbottles, hence known as the Rescue Kenzan (レスキュー剣山, Resukyū Kenzan). It is a Touto Best Match, and is themed after a hedgehog and a fire engine.

In this Best Match form, Build is armed with the Multi Deluge Gun (マルチデリュージガン, Maruchi Deryūji Gan) on his left arm that can shoot water, fire (thanks to flammable liquids), or extend. The mounted BLD Emergency Shoulder (BLDエマージェンシーショルダー, Biru Emājenshī Shorudā) can shoot coolant and cleaning liquids, as well as winch victims to safety thanks to an inbuilt power winch.

This form give build balanced boost in punching, kicking and jumping power, albeit at the cost of his running speed.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build extends the Multi Deluge Gun and uses it to stab the enemy, then fills them up with water and surrounds them with a white energy chart before jumping up such that he's perpendicular with the ground, then dropping down, and punching the enemy with the Spine Knuckle.

Appearances: Build Episode 8, 10, 15, 19

HarinezumiTank Form
KRBu-Buildharinezumitank

HarinezumiTank Form

"Harinezumi! Tank! Are you ready? (Funky music)"
―HarinezumiTank's transformation announcement[src]
Rider Statistics[29][30]
  • Rider Height: 194 cm
  • Rider Weight: 102.7 kg
Ability Parameters[29][30]
  • Punching Power: 11 t (right arm)/13.6 t (left arm)
  • Kicking Power: 19 t (right leg)/11.2 t (left leg)
  • Maximum Jump Height: 28.4 m
  • Maximum Running Speed: 100 m per 7 seconds

HarinezumiTank Form (ハリネズミタンクフォーム, Harinezumi Tanku Fōmu) is Build's white and blue Trial Form accessed through the Harinezumi and Tank Fullbottles, themed after a hedgehog and a tank.

Compared to RabbitTank, this Trial Form has a stronger amount of Punching Power in its right arm, while being weaker in the left. The rest of the Ability Parameters are overall much worse in comparison.

In this Trial Form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ, Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

Appearances: Build Episodes 1-2

Trial Forms
"Harinezumi! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Lion Fullbottle, Build is armed with the Gold Lio Gauntlet (ゴルドライオガントレット, Gorudo Raio Gantoretto) on his right arm that lets him shoot bursts of yellow energy by punching. It can also absorb energy in battle to empower itself.

LionCleaner Form
KRBu-Buildlioncleaner

LionCleaner Form

"Lion! Soujiki! Best Match! Are you ready? (Techno rock music) Tategami cyclone! LionCleaner! Yeah!"
―LionCleaner's transformation announcement[src]
Rider Statistics[31][32]
  • Rider Height: 189 cm
  • Rider Weight: 104.3 kg
Ability Parameters[31][32]
  • Punching Power: 17.4 t (right arm)/7.1 t (left arm)
  • Kicking Power: 12 t (right leg)/21.3 t (left leg)
  • Maximum Jump Height: 39 m
  • Maximum Running Speed: 100 m per 3.6 seconds

LionCleaner Form (ライオンクリーナーフォーム, Raion Kurīnā Fōmu) is Build's marigold and turquoise Best Match form accessed with the Lion and Soujiki Fullbottles, hence known as the Mane Cyclone (鬣サイクロン, Tategami Saikuron). It is a Touto Best Match, and is themed after a lion and a vacuum cleaner.

In this Best Match form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in. On the right arm, the BLD Battle Lio Shoulder (BLDバトライオショルダー, BLD Batoraio Shorudā)'s 'tail' can be removed and used as a whip.

This form grants Build a balanced boost in all his ability parameters. This is also Build's third fastest form.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build uses the Long Range Cleaner to suck the enemy towards him, holding it in place, before coating the Gold Lio Gauntlet in yellow energy, then firing off an energy lion head that bites the opponent on contact.

Though Build possessed both Fullbottles needed for this form for an extended time and seemingly knew of their Best Match, he didn't use them until much later, likely because Lion was always being used for the Machine Builder.

Appearances: Build Episodes 9-10, 15

LionComic Form
KRBu-Buildlioncomic

LionComic Form

"Lion! Comic! Are you ready? (Funky music)"
―LionComic's transformation announcement[src]
Rider Statistics[33][34]
  • Rider Height: 194 cm
  • Rider Weight: 99 kg
Ability Parameters[33][34]
  • Punching Power: 13.9 t (right arm)/7 t (left arm)
  • Kicking Power: 8.1 t (right leg)/17 t (left leg)
  • Maximum Jump Height: 32.8 m
  • Maximum Running Speed: 100 m per 5.6 seconds

LionComic Form (ライオンコミックフォーム, Raion Komikku Fōmu) is Build's marigold and yellow Trial Form accessed with the Lion and Comic Fullbottles, themed after a lion and a comic book.

In this Trial Form, Build is armed with the 4Koma Ninpoutou.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku)

This form is exclusive to Kamen Rider Build Episode 15

Trial Forms
"Lion! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Dragon Fullbottle, Build can make powerful punches and scratches with his right hand augmented by blue flames. Any form using this Fullbottle tends to be unstable, due to its immense power and close tuning to Ryuga Banjo.

Its power is so strong that even its Best Match configuration cannot stabilize it for long, and Build can be forced out of his transformation and get injured.

KeyDragon Form
KRBu-Buildkeydragon

KeyDragon Form

"Dragon! Lock! Best Match! Are you ready? (Fantasy-themed music) Fūin no fantasy star! KeyDragon! Yeah!"
―KeyDragon's transformation announcement[src]
Rider Statistics[35][36]
  • Rider Height: 196 cm
  • Rider Weight: 108 kg
Ability Parameters[35][36]
  • Punching Power: 19.7 t (right arm)/16.9 t (left arm)
  • Kicking Power: 17.6 t (right leg)/24.1 t (left leg)
  • Maximum Jump Height: 47.4 m
  • Maximum Running Speed: 100 m per 5.1 seconds

KeyDragon Form (キードラゴンフォーム, Kī Doragon Fōmu) is Build's navy and gold Best Match form accessed with the Dragon and Lock Fullbottles, hence known as the Sealed Fantasy Star (封印のファンタジースター, Fūin no Fantajī Sutā). It is a Touto Best Match, and is themed after a dragon and a lock.

This form grants Build a significant parameter boost along with jumping power, albeit at a cost in running speed. Despite its tremendous power, this form also possesses a drawback of a potential overload due to the Dragon Fullbottle's strong synchronization with Ryuga.

In this Best Match Form, Build is armed with the Bind Master Key ( バインドマスターキー, Baindo Masutā Kī) on his left arm which can be used as a battering weapon due to its weight.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build fires several chains, which have been generated by the BLD Security Shoulder (BLDセキュリティショルダー, BLD Sekyuriti Shorudā) from the Bind Master Key to bind the opponent in place before creating and throwing a powerful dark blue fireball, that detonates upon impact.

Appearances: Build Episode 10-11

Trial Forms
"Dragon! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Kaizoku Fullbottle, Build wields the Kaizoku Hassyar.

KaizokuRessya Form
KRBu-Buildkaizokuressya

KaizokuRessya Form

"Kaizoku! Densya! Best Match! Are you ready? (Pirate-themed string music) Teikoku no hangyakusha! KaizokuRessya! Yeah!"
―KaizokuRessya's transformation announcement[src]
Rider Statistics[37][38][39]
  • Rider Height: 189 cm
  • Rider Weight: 95.8 kg
Ability Parameters (Standard → Prototype)[37][38][39]
  • Punching Power: 12 t → 17.8 t (right arm)/12.7 t → 18.8 t(left arm)
  • Kicking Power: 15 t → 22.2 t (right leg)/13.8 t → 20.4 t (left leg)
  • Maximum Jump Height: 39.4 m → 51.2 m
  • Maximum Running Speed: 100 m per 2.5 seconds → 1.7 seconds

KaizokuRessya Form (海賊レッシャフォーム, Kaizoku Ressha Fōmu, lit. PirateTrain Form)[40] is Build's azure and lime green Best Match form accessed with the Kaizoku and Densya Fullbottles, hence known as the Punctual Rebel (定刻の反逆者, Teikoku no Hangyakusha). It is a Touto Best Match, and is themed after a pirate and a train.

Being based on a train, this form is Build's fastest Best Match form, only being outpaced by Trial Form NinjyaTank by 0.2 seconds. The Kaizoku Hassyar was designed for this Best Match.

In this form, Build is armed with the Train Gauntlet (トレインガントレット, Torein Gantoretto) on his left arm for increased speed, and the Multisail Mantle (マルチセイルマント, Maruchi Seiru Manto) on his right shoulder for increased agility and throwing net-like capturing manoeuvres.

Using the Kaizoku Hassyar, Build can perform three different special attacks by pulling back the Build Arrow and holding it before letting go. Charging the Kaizoku Hassyar escalates its shot through three of the four tiers. While performing any of this attacks, the Kaizoku Hassyar announces Shuppatsu (出発 lit. Departure).

Build Driver finisher
  • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu):
Drill Crusher finisher
  • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
    • Blade Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
      • Kaizoku: The Drill Spiral Blade spins such that it creates an energy whirlpool before Build performs a double azure energy slash.
Kaizoku Hassyar finisher
  • Kaizoku Densya (海賊電車): After charging the Kaizoku Hassyar by pulling back the Build Arrow and holding it until it reaches the final tier, Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well. While performing this finisher, the Kaizoku Hassyar announces Hassha (発射 lit. Fire).
    • Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well.
Appearances: Build Episodes 12-13, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15, 19, 43

KaizokuGatling Form
KRBu-Buildkaizokugatling

KaizokuGatling Form

"Kaizoku! Gatling! Are you ready? (Funky music)"
―KaizokuGatling's transformation announcement[src]
Rider Statistics[41][42]
  • Rider Height: 189 cm
  • Rider Weight: 98.1 kg
Ability Parameters[41][42]
  • Punching Power: 9.6 t (right arm)/8 t (left arm)
  • Kicking Power: 10.8 t (right leg)/11 t (left leg)
  • Maximum Jump Height: 33.1 m
  • Maximum Running Speed: 100 m per 6.7 seconds

KaizokuGatling Form (海賊ガトリングクフォーム, Kaizoku Gatoringu Fōmu) is Build's azure and gray Trial Form accessed through the Kaizoku and Gatling Fullbottles, themed after a pirate and a gatling gun. In this Trial Form, Build is armed with the Hawk Gatlinger.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 16

Trial Forms
"Kaizoku! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special. KaizokuSyoubousya specifically was almost used in Build Episode 8.

In any form that uses the Octopus Fullbottle, Build is armed with the Twist Lash Arm (ツイストラッシュアーム, Tsuisuto Rasshu Āmu) on his right shoulder that can be used to bind his opponents.

OctopusLight Form
KRBu-Buildoctopuslight

OctopusLight Form

"Octopus! Light! Best Match! Are you ready? (Electronic music) Inazuma technician! OctopusLight! Yeah!"
―OctopusLight's transformation announcement[src]
Rider Statistics[43][44]
  • Rider Height: 193.5 cm
  • Rider Weight: 96.5 kg
Ability Parameters[43][44]
  • Punching Power: 4.4 t (right arm)/4.8 t (left arm)
  • Kicking Power: 8.6 t (right leg)/8 t (left leg)
  • Maximum Jump Height: 42.1 m
  • Maximum Running Speed: 100 m per 6.5 seconds

OctopusLight Form (オクトパスライトフォーム, Okutopasu Raito Fōmu) is Build's magenta and light yellow Best Match form accessed with the Octopus and Light Fullbottles, hence known as the Lightning Technician (稲妻テクニシャン, Inazuma Tekunishan). It is a Touto Best Match, and is themed after an octopus and a light bulb.

This is Build's weakest Best Match form in terms of ability parameters. However, his jumping power and speed is on average. As such, Build is restricted to OctopusLight's special abilities to win fights.

In this Best Match form, he is armed with the Shade Breaker (シェードブレイカーム, Shēdo Bureikā) and the BLD Light Bulb Shoulder (BLDライトバルブショルダー, BLD Raito Barubu Shorudā), which can both be used together to create lightning in order to attack his opponents.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build fires an orb of jet-black ink from the head of the Twist Lash Arm that traps the enemy before snaring them with its tentacles, then using both the Shade Breaker and BLD Light Bulb Shoulder to shock the trapped enemy via a punching maneuver.

Appearances: Build Episode 13-14, 16

Trial Forms
"Octopus! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Phoenix Fullbottle, Build is armed with the Flame Reviver (フレイムリヴァイバー, Fureimu Rivaibā) gauntlet on his right arm for pyrokinesis and Imperial Wings (エンパイリアルウィング, Enpairiaru Uingu) on his back that grant him the ability to fly.

PhoenixRobo Form
KRBu-Buildphoenixrobo

PhoenixRobo Form

"Phoenix! Robot! Best Match! Are you ready? (Dark classical music) Fujimi no heiki! PhoenixRobo! Yeah!"
―PhoenixRobo's transformation announcement[src]
Rider Statistics[45][46]
  • Rider Height: 191 cm
  • Rider Weight: 112.3 kg
Ability Parameters[45][46]
  • Punching Power: 15.7 t (right arm)/28.8 t (left arm)
  • Kicking Power: 23.4 t (right leg)/16.8 t (left leg)
  • Maximum Jump Height: 43.6 m
  • Maximum Running Speed: 100 m per 6.4 seconds

PhoenixRobo Form (フェニックスロボフォーム, Fenikkusu Robo Fōmu) is Build's vermillion and gunmetal gray Best Match form accessed with the Phoenix and Robot Fullbottles, hence known as the Immortal Weapon (不死身の兵器, Fujimi no Heiki). It is a Hokuto Best Match, and is themed after a phoenix and a robot.

In this Best Match form, Build is armed with the Demolition One (デモリションワン, Demorishon Wan) on his left hand for dismantling and crushing targets, which connected to the BLD Arsenal Shoulder (BLDアーセナルショルダー, Birudo Āsenaru Shorudā) on his left shoulder that allows him to turn dismantled objects into his personal robot troops.

Stat-wise, this Best Match is significantly stronger than all previous Best Matches, and its punching power even surpasses RabbitTank Sparkling. In this form, Build handled the Hokuto Sanbagarasu quite easy, which is something he couldn't do with RabbitTank Sparkling.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build covers himself in a bird-shaped flame before ramming the enemy into the air, then flies after the enemy before repeatedly ramming into it.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 18, Raising the Hazard Level ~7 Best Matches~: First Chapter

PhoenixSoujiki Form
KRBu-Buildphoenixsoujiki

PhoenixSoujiki Form

"Phoenix! Soujiki! Are you ready? (Funky music)"
―PhoenixSoujiki's transformation announcement[src]
Rider Statistics[47][48]
  • Rider Height: 191 cm
  • Rider Weight: 98 kg
Ability Parameters[47][48]
  • Punching Power: 12.6 t (right arm)/5.7 t (left arm)
  • Kicking Power: 9.6 t (right leg)/13.4 t (left leg)
  • Maximum Jump Height: 37.9 m
  • Maximum Running Speed: 100 m per 3.8 seconds

PhoenixSoujiki Form (フェニックス掃除機フォーム, Fenikkusu Sōjiki Fōmu) is Build's vermillion and turquoise Trial Form accessed through the Phoenix and Soujiki Fullbottles, themed after a phoenix and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

Appearances: Build Episodes 19, 21

Trial Forms
"Phoenix! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Wolf Fullbottle, Build is armed with the Wolfatal Claw (ウルフェイタルクロー, Urufeitaru Kurō) on his right arm for channeling animal instinct.

SmaphoWolf Form
KRBu-Buildsmaphowolf

SmaphoWolf Form

"Wolf! Smapho! Best Match! Are you ready? (Classic rock music) Tsunagaru ippiki ookami! SmaphoWolf! Yeah!"
―SmaphoWolf's transformation announcement[src]
Rider Statistics[49][50]
  • Rider Height: 189 cm
  • Rider Weight: 91.6 kg
Ability Parameters[49][50]
  • Punching Power: 16.6 t (right arm)/5.2 t (left arm)
  • Kicking Power: 10.4 t (right leg)/20.8 t (left leg)
  • Maximum Jump Height: 41.6 m
  • Maximum Running Speed: 100 m per 5.1 seconds

SmaphoWolf Form (スマホウルフフォーム, Sumaho Urufu Fōmu) is Build's silver and blue Best Match form accessed with the Wolf and Smapho Fullbottles, hence known as the Connected Lone Wolf (繋がる一匹狼, Tsunagaru Ippiki Ōkami). It is a Hokuto Best Match, and is themed after a wolf and the Build Phone.

In this Best Match form, Build is armed with the Build Pad Shield (ビルドパッドシールド, Birudo Paddo Shīrudo) on his left arm for either defending capabilities or selecting a recommended attack enhancement. Although the Build Pad Shield cracks upon sustaining a strong attack, it can repair itself. Befitting its identical appearance to the Build Phone, the Build Pad Shield can also function in the same manner, with the exception of Bike Mode. Additionally, the Build Pad Shield has sharp corners, allowing it to damage enemies if hit at the corners.

One of the most unique features of the SmaphoWolf Form is the left side Social Chest Armor (ソーシャルチェストアーマー, Sōsharu Chesuto Āmā), which allows Build to make long distance communications. Also, through some unknown mechanism, the more people there are that supports Build on social media, the more stronger Build gets.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build surrounds himself with a ring of energy smartphone icons before a black energy wolf shadow circles it, leaps out, and rams into any enemy within the ring.

Appearances: Build Episodes 9 (mentioned), 18

Trial Forms
"Wolf! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Rose Fullbottle, Build is armed with the Ibalash Arm (イバラッシュアーム, Ibarasshu Āmu) on his right arm for manipulating plant vines or firing thorn projections. A stretchable black whip is laced around it.

RoseCopter Form
KRBu-Buildrosecopter

RoseCopter Form

"Rose! Helicopter! Best Match! Are you ready? (Spanish music) Jounetsu no senpūki! RoseCopter! Yeah!"
―RoseCopter's transformation announcement[src]
Rider Statistics[51][52]
  • Rider Height: 190 cm
  • Rider Weight: 94.2 kg
Ability Parameters[51][52]
  • Punching Power: 6.3 t (right arm)/12.9 t (left arm)
  • Kicking Power: 14.4 t (right leg)/10.6 t (left leg)
  • Maximum Jump Height: 42.8 m
  • Maximum Running Speed: 100 m per 5.6 seconds

RoseCopter Form (ローズコプターフォーム, Rōzu Koputā Fōmu) is Build's vermillion and turquoise Best Match form accessed with the Rose and Helicopter Fullbottles, hence known as the Fan of Passion (情熱の扇風機, Jōnetsu no Senpūki). It is a Hokuto Best Match, and is themed after a rose and a helicopter.

In this Best Match form, Build is armed with the Batrotor Blade (バトローターブレード, Batorōtā Burēdo) which he can use to fly, or alternatively, use as a bladed weapon. The left side BLD Pilot Shoulder (BLDパイロットショルダー, BLD Pairotto Shorudā) acts as a sort of A.I. pilot, and can take Build to almost any destination on voice command. Also, it can store various supplies inside its compression containers.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): This finisher has two variations:

  • Build removes the Batrotor Blade from his back, then covers it in red energy rose vines as it starts spinning before flying at the enemy for a slashing attack.[The Unstoppable Hazard]
  • During an experimental test conducted by Sento and Nariaki, Build flies with the Batrotor Blade on his back as he catches any escaping targets with the vine summoned by the Ibalash Arm before dragging his target to the spinning rotor to be sliced with.[Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: First Chapter]
Appearances: Build Episode 21, Raising the Hazard Level ~7 Best Matches~: First Chapter, Build 22

RoseSoujiki Form
KRBu-Buildrosesoujiki

RoseSoujiki Form

"Rose! Soujiki! Are you ready? (Funky music)"
―RoseSoujiki's transformation announcement[src]
Rider Statistics[53][54]
  • Rider Height: 190 cm
  • Rider Weight: 93.2 kg
Ability Parameters[53][54]
  • Punching Power: 5 t (right arm)/5.7 t (left arm)
  • Kicking Power: 9.6 t (right leg)/8.5 t (left leg)
  • Maximum Jump Height: 31.8 m
  • Maximum Running Speed: 100 m per 5.7 seconds

RoseSoujiki Form (ローズ掃除機フォーム, Rōzu Sōjiki Fōmu) is Build's vermillion and turquoise Trial Form accessed through the Rose and Soujiki Fullbottles, themed after a rose and a vacuum cleaner.

In this Trial Form, Build is armed with the Long Range Cleaner (ロングレンジクリーナー, Rongu Renji Kurīnā) on his left arm that can suck things in with high-velocity winds, and the Trash Converter (トラッシュコンバーター, Torasshu Konbātā) on his left shoulder that stores what has been sucked in.

This Trial Form gives Build the ability to absorb any elemental attacks using the Long Range Cleaner, and safely disarm the accumulated attack using the Trash Converter.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 21

RoseSyoubousya Form
KRBu-Buildrosesyoubousya

RoseSyoubousya Form

"Rose! Syoubousya! Are you ready? (Funky music)"
―RoseSyoubousya's transformation announcement[src]
Rider Statistics[55][56]
  • Rider Height: 190 cm
  • Rider Weight: 99.5 kg
Ability Parameters[55][56]
  • Punching Power: 5 t (right arm)/9.5 t (left arm)
  • Kicking Power: 11.8 t (right leg)/8.5 t (left leg)
  • Maximum Jump Height: 30.1 m
  • Maximum Running Speed: 100 m per 5 seconds

RoseSyoubousya Form (ローズ消防車フォーム, Rōzu Shōbōsha Fōmu) is Build's vermillion and scarlet Trial Form accessed through the Rose and Syoubousya Fullbottles, themed after a rose and a fire engine.

In this Trial Form, Build is armed with the Multi Deluge Gun (マルチデリュージガン, Maruchi Deryūji Gan) on his left arm that can shoot water, fire, or extend.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku).

This form is exclusive to Kamen Rider Build Episode 25

Trial Forms
"Rose! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Tora Fullbottle, Build is armed with the BLD Tora Fight Glove (BLDトラファイトグローブ, BLD Tora Faito Gurōbu) on his right hand for slashing attacks, the Jungle Foot Shoes (ジャングルフットシューズ, Janguru Futto Shūzu) for leaping at the enemy at blurring speeds for a split second, and the BLD Tiger Head Shoulder (BLDタイガーヘッドショルダー, BLD Taigā Heddo Shorudā) which can be removed and used as a fanged boxing glove[57]

ToraUFO Form
KRBu-Buildtoraufo

ToraUFO Form

"Tora! UFO! Best Match! Are you ready? (Jungle music) Mikakunin jungle hunter! ToraUFO! Yeah!"
―ToraUFO's transformation announcement[src]
Rider Statistics[58][59]
  • Rider Height: 189 cm
  • Rider Weight: 100.5 kg
Ability Parameters[58][59]
  • Punching Power: 17.8 t (right arm)/5.1 t (left arm)
  • Kicking Power: 8.7 t (right leg)/21.2 t (left leg)
  • Maximum Jump Height: 46.5 m
  • Maximum Running Speed: 100 m per 3.9 seconds

ToraUFO Form (トラユーフォーフォーム, Tora Yūfō Fōmu) is Build's marigold and pink Best Match form accessed with the Tora and UFO Fullbottles, hence known as the Unidentified Jungle Hunter (未確認ジャングルハンター, Mikakunin Janguru Hantā). It is a Seito Best Match, and is themed after a tiger and a UFO.

In this form, This form grants Build a balanced boost in all his ability parameters akin to LionCleaner. He is also armed with the Inbay Dodge Shoes (インベイダッジシューズ, Inbei Dajji Shūzu) that can generate a pink, energy UFO beneath him for hovering capabilities. The left side's BLD Portal Ship Shoulder (BLDポータルシップショルダー, BLD Pōtaru Shippu Shorudā) contains devices that can teleport enemies away that have been shrunken down and kidnapped by the Abduction Beamers (アブダクションビーマー, Abudakushon Bīmā).

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build generates a pink, energy UFO that rams into any enemy before sucking them up and shredding them to pieces.

Appearances: Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

Trial Forms
"Tora! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Kujira Fullbottle, Build is armed with the Navy Chest Armor (ネイビーチェストアーマー, Neibī Chesuto Āmā) for protection against water pressure, and the BLD Spout Glove (BLDスパウトグローブ, BLD Supauto Gurōbu) on his right hand for a water-based shooting attack.

KujiraJet Form
KRBu-Buildkujirajet

KujiraJet Form

"Kujira! Jet! Best Match! Are you ready? (Tropical music) Amakakeru big wave! KujiraJet! Yeah!"
―KujiraJet's transformation announcement[src]
Rider Statistics[60]
  • Rider Height: 189.5 cm
  • Rider Weight: 116.5 kg
Ability Parameters[60]
  • Punching Power: 18.0 t (right arm)/13.5 t (left arm)
  • Kicking Power: 23.0 t (right leg)/25.5 t (left leg)
  • Maximum Jump Height: 46.2 m
  • Maximum Running Speed: 100 m per 6.9 seconds

KujiraJet Form (クジラジェットフォーム, Kujira Jetto Fōmu) is Build's navy and cyan Best Match form accessed with the Kujira and Jet Fullbottles, hence known as the Big Wave Flying through the Sky (天駆けるビッグウェーブ, Amakakeru Biggu Wēbu). It is a Seito Best Match, and is themed after a whale and a jet plane.

Build Driver finisher
  • Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build floods the area in front of him and goes underwater, then a giant whale comes up and boosts Build with its blowhole allowing Build to fly out of the water, and perform a powerful kick at the enemy.
Drill Crusher finisher
  • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
    • Gun Mode: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful blast.
      • Sensuikan: Build shoots some torpedoes at the enemy.
Appearances: Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

KujiraSyoubousya Form
KRBu-Buildkujirasyoubousya

KujiraSyoubousya Form

"Kujira! Syoubousya! Are you ready? (Funky music)"
―KujiraSyoubousya's transformation announcement[src]
Rider Statistics[61][62]
  • Rider Height: 189.5 cm
  • Rider Weight: 120 kg
Ability Parameters[61][62]
  • Punching Power: 14.4 t (right arm)/9.5 t (left arm)
  • Kicking Power: 11.8 t (right leg)/20.4 t (left leg)
  • Maximum Jump Height: 28.8 m
  • Maximum Running Speed: 100 m per 7 seconds

KujiraSyoubousya Form (クジラ消防車フォーム, Kujira Shōbōsha Fōmu) is Build's navy and scarlet-colored Trial Form accessed from the Kujira and Syoubousya Fullbottles. It is themed after a whale and a fire engine.

This form is exclusive to Kamen Rider Build Episode 25

Trial Forms
"Kujira! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

In any form that uses the Kirin Fullbottle, Build can slash the opponent with the giraffe neck on his right hand.

KirinCyclone Form
KRBu-Buildkirincyclone

KirinCyclone Form

"Kirin! Senpuki! Best Match! Are you ready? (Techno rock music) Arashi o yobu kyotō! KirinCyclone! Yeah!"
―KirinCyclone's transformation announcement[src]
Rider Statistics[63]
  • Rider Height: 190.0 cm
  • Rider Weight: 109 kg
Ability Parameters[63]
  • Punching Power: 20.1 t (right arm)/5.3 t (left arm)
  • Kicking Power: 8.8 t (right leg)/23.2 t (left leg)
  • Maximum Jump Height: 39 m
  • Maximum Running Speed: 100 m per 5.6 seconds

KirinCyclone Form (キリンサイクロンフォーム, Kirin Saikuron Fōmu) is Build's gold and baby blue Best Match form accessed with the Kirin and Senpuki Fullbottles, hence known as the Towering Storm-Caller (嵐を叫ぶ巨塔, Arashi o Yobu Kyotō). It is a Seito Best Match themed after a giraffe and an electric fan.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build flies to the enemy with his fan arm, then summons an energy giraffe neck and attacks the enemy with it.

Appearances: Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Next Chapter, Build Episode 22

Trial Forms
"Kirin! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

RabbitTank Sparkling Form
KRBu-Buildrabbittanksparkling

RabbitTank Sparkling Form

"RabbitTank Sparkling! Are you ready? (Techno rock music) Shuwatto hajikeru! RabbitTank Sparkling! Yea-Yeah!"
―RabbitTank Sparkling's transformation announcement[src]
Rider Statistics[64][65]
  • Rider Height: 202 cm
  • Rider Weight: 102.1 kg
Ability Parameters[64][65]
  • Punching Power: 14.9 t (right arm)/25.5 t (left arm)
  • Kicking Power: 35.6 t (right leg)/26.7 t (left leg)
  • Maximum Jump Height: 66 m
  • Maximum Running Speed: 100 m per 2 seconds

RabbitTank Sparkling Form (ラビットタンクスパークリングフォーム, Rabitto Tanku Supākuringu Fōmu) is Build's carbonated soda upgrade form accessed with the RabbitTank Sparkling Fullbottle.

RabbitTank Sparkling, in comparison to RabbitTank, is a vast improvement. It can run faster than KaizokuRessya, jump higher than RabbitTank, and has superior punching and kicking power parameters, with the right leg boasting more power then any of Build's previously introduced forms.

In addition, RabbitTank Sparkling's gains the red R Sparkling Blade (Rスパークリングブレード, R Supākuringu Burēdo) and the blue T Sparkling Blade (Tスパークリングブレード, T Supākuringu Burēdo) on its right and left arm respectively, allowing Build to utilise close quarter slashing attacks.

This form allows Build to use the Drill Crusher, Hawk Gatlinger, 4Koma Ninpoutou and Kaizoku Hassyar without restrictions.

When initiating a finisher, the Carbonic Chest Armor (カルボニックチェストアーマー, Karubonikku Chesuto Āmā) generates multiple Dimension Bubbles[66] (ディメンションバブル, Dimenshon Baburu), which can distort local space, that cover Build's attacking limb.

Build Driver finisher
  • Sparkling Finish (スパークリングフィニッシュ, Supākuringu Finisshu): This finisher has three variations:
    • Build delivers a powerful bubbly kick attack at the enemy
    • Build leaps high into the air before creating a red and blue, spiraling, hourglass-shaped vortex resembling a wormhole. He then dives down through the wormhole, and kicks. The wormhole is also capable of sucking in and disintegrating opponents' attacks.
    • Build delivers a powerful bubbly kick attack at the enemy from behind in close range.
Kaizoku Hassyar finisher
  • Kaizoku Densya (海賊電車 lit. Pirate Train): It is charged by pulling back the Build Arrow and holding it before letting go. While performing this finisher, the Kaizoku Hassyar announces Hassha (発射 lit. Fire).
    • Build fires a green and azure energy train from the Kaizoku Hassyar that not only rams into the enemy, but shoots azure energy discs as well.
Build Driver + Drill Crusher finisher
  • Sparkling Finish/Vortex Break (スパークリングフィニッシュ/ボルテックブレイク, Supākuringu Finisshu/Borutekku Bureiku): After plugging a Fullbottle into the Full Bottle Slot of the Drill Crusher, Build can perform a powerful, bubbly finisher.
    • Blade Mode: Build channels the energy of a Full Bottle in his Drill Crusher and performs a powerful slash.
      • Kabutomushi: The Drill Spiral Blade cloaks itself in an energy projection resembling a rhinoceros beetle's horn and performs a powerful, bubbly stab attack.
Appearances: Build Episode 14, Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build 15-20, 22-25, Raising the Hazard Level ~7 Best Matches~: Final Chapter, Build 27, 49

By attaching the Hazard Trigger to the Build Driver, Build can upgrade any of his Best Match forms into a Hazard Form. This results in a base Hazard Form body with the eyes of the Best Match used. While Hazard Forms lack the unique equipment of a normal Best Match's Halfbodies, they still retain some access to their specific powers, and can use any handheld weapon tied to that Best Match.

The Hazard Trigger grants a massive strength, capable of destroying even a Hazard Smash with little effort, but usage of it puts the user at risk of losing self-awareness and going on a destructive rampage.

All of Build's forms accessed with the Hazard Trigger are armed with the HZ Deadly Gloves and HZ Vanish End Shoes.

RabbitTank Hazard Form

KRBu-Buildrabbittankhazard

RabbitTank Hazard Form

KRBu-Buildrabbittankhazard (Two Left Eye Rabbit HZs)

RabbitTank Hazard Form (Two Left Eye Rabbit HZs)

"Rabbit! Tank! Super Best Match! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Hazard Form transformation announcement[src]
Rider Statistics[67][68]
  • Rider Height: 197.5 cm
  • Rider Weight: 101 kg
Ability Parameters[67][68]
  • Punching Power: 19.8 t (right arm)/34 t (left arm)
  • Kicking Power: 47.4 t (right leg)/35.6 t (left leg)
  • Maximum Jump Height: 77 m
  • Maximum Running Speed: 100 m per 1.4 seconds

RabbitTank Hazard Form (ラビットタンクハザードフォーム, Rabitto Tanku Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading RabbitTank Form with the Hazard Trigger.

In this form, Build's stats greatly surpass any other form, Rider, or Smash up to its appearance.

RabbitTank Hazard Form consists of the following parts
  • BLD-RT Hazard Head (BLD-RTハザードヘッド, BLD-RT Hazādo Heddo): The helmet.
    • Furious Head Armor (フュリオスヘッドアーマー, Fu~yuriosu Heddo Āmā): The jet black hear armor. Durability is raised thanks to a special strengthening agent, allowing the user to reduce the distance between them and the enemy while resisting their attacks.
    • Dangerous Enhancer (デンジャラスエンハンサー, Denjarasu Enhansā): A strengthening device located on the forehead. It forcibly triggers a struggling instinct via special strengthening agents that it inserts into certain parts of the brain, raising attack power. However, this function puts an excessive load to the user's mental state, and there is a risk of losing one's sense of self during long battles due to continuous use. Additionally, the strengthening agent affects the limbic system, especially the amygdala, which may cause mental changes after combat.
    • BLD Signal HZ (BLDシグナルHZ, BLD Shigunaru HZ): A data collection device located on the Dangerous Enhancer. It not only collects combat data in real time, but also performs emergency repairs on the body when necessary. It also collects data on the enemy, allowing the user to grasp their abilties.
    • Left Eye Rabbit HZ (レフトアイラビットHZ, Refuto Ai Rabitto HZ): The left eyepiece. The eyepiece. Enhances response speed and search accuracy, and a special olfactory sensor is incorporated to locate hidden enemies.
    • Ear Face Module HZ (イヤーフェイスモジュールHZ, Iyā Feisu Mojūru HZ): The ‘rabbit ear’ on the Left Eye Rabbit section. Enhances Build’s sense of hearing and predicts enemy movement by capturing their current movement, allowing for a quick counterattack.
    • Right Eye Tank HZ (ライトアイタンクHZ, Raito Ai Tanku HZ): The right eyepiece. Instantly performs calculations on ballistic trajectories to increase the hit rate of any handheld weapon that Build may be holding.
    • Cannon Face Module HZ (キャノンフェイスモジュールHZ, Kyanon Feisu Mojūru HZ): The ‘tank turret’ on the Right Eye Tank HZ. Through unknown means, it can increase the firepower, range and explosive impact power of any weapon being used.
  • HZ Furious Chest Armor (HZフュリオスチェストアーマー, HZ Fu~yuriosu Chesuto Āmā): The jet black chest armor. Durability is raised thanks to a special strengthening agent, allowing the user to reduce the distance between them and the enemy while resisting their attacks. A black gas capable of harming can be discharged into the surrounding area. The black gas can also expose hidden enemies.
  • HZ Violent Shoulders (HZヴァイオレントショルダー, HZ Vu~aiorento Shorudā): The shoulder armor. When switching to Over Flow Mode or when initiating a special attack, a strengthening agent is inserted into the body, raising the attack power of each body part. It can also fortify the arm and leg armor, making them heavy.
  • HZ Grave Rush Arms (HZグレイヴラッシュアーム, HZ Gureivu Rasshu Āmu): The arms. Their basic attack ability has been raised thanks to a special strengthening agent, making it possible to mercilessly kill an enemy with a single punch. The right arm possesses the characteristics of the Rabbit Fullbottle, while the left arm possesses the characteristics of the Tank Fullbottle.
  • HZ Deadly Gloves (HZデッドリーグローブ, HZ Deddorī Gurōbu): The reinforced hands. It has a function to disassemble and disperse anything that comes into contact with it. When a special move is initiated, enemy armor can be extinguished with a single punch, and energy is inserted into the point of impact for assured destruction. As the timeframe of a battle increases, the user 's urge to destroy increases due to the special strengthening devices, increasing attack power.
  • HZ Unlimited Suit (HZアンリミテッドスーツ, HZ Anrimiteddo Sūtsu): The shock-resistant bodysuit. Along with protecting the wearer’s body, there is a limiter installed that can be released to bring out full physical ability.
  • HZ Grave Rush Legs (HZグレイヴラッシュレッグ, HZ Gureivu Rasshu Reggu): The legs. Their basic attack ability has been raised thanks to a special strengthening agent, making it possible to mercilessly kill an enemy with a single kick. The right leg possesses the characteristics of the Tank Fullbottle, while the left leg possesses the characteristics of the Rabbit Fullbottle.
  • HZ Vanish End Shoes (HZヴァニッシュエンドシューズ, HZ Vu~anisshu Endo Shūzu): The shoes. It has a function to disassemble and disperse anything that comes into contact with it. When a special move is initiated, enemy armor can be extinguished with a single punch, and energy is inserted into the point of impact for assured destruction. As the timeframe of a battle increases, the user 's urge to destroy increases due to the special strengthening devices, increasing attack power.
Finishers
  • Over Flow (オーバーフロー, Ōbāfurō): This finisher has two variations:
    • Build transfers surplus Nebula Gas into his HZ Deadly Gloves (HZデッドリーグローブ, HZ Deddorī Gurōbu) and throws powerful punches and kicks. Additionally, Build also can simply touch the enemy for about several seconds to deliver electricity that paralyze the enemy.
    • Build rushes at the enemy at maximum speed
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu): This finisher has two variations:
    • Build coats his right HZ Vanish End Shoe (HZヴァニッシュエンドシューズ, HZ Vanisshu Endo Shūzu) in dark purple energy before delivering a powerful side kick.
    • Build rushes towards the enemy and performs a flying kick.
Appearances: Build Episodes 20- 21, Raising the Hazard Level ~7 Best Matches~: Final Chapter, Build 22-26

SmaphoWolf Hazard Form
KRBu-Buildsmaphowolfhazard

SmaphoWolf Hazard Form

"Wolf! Smapho! Super Best Match! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Hazard Form transformation announcement[src]
Rider Statistics[69]
  • Rider Height: 197.5 cm
  • Rider Weight: 101.0 kg
Ability Parameters[69]
  • Punching Power: 33.2 t (right arm)/10.4 t (left arm)
  • Kicking Power: 20.8 t (right leg)/41.6 t (left leg)
  • Maximum Jump Height: 58.2 m
  • Maximum Running Speed: 100 m per 2.5 seconds

SmaphoWolf Hazard Form (スマホウルフハザードフォーム, Sumaho Urufu Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading SmaphoWolf Form with the Hazard Trigger.

From the Tu-Ka Face Module (ツーカーフェイスモジュール, Tsūkā Feisu Mojūru) (the phone icon on the right eye), Build is able to send a series of energy projections of app icons which encircle the enemy, disorienting and attacking them.

Build Driver finishers
  • Over Flow (オーバーフロー, Ōbāfurō): Build transfers surplus Nebula Gas into his HZ Deadly Gloves (HZデッドリーグローブ, HZ Deddorī Gurōbu) and delivers a powerful punch, summoning a wolf-like energy projection which "bites" down on the enemy.
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu):
Drill Crusher finisher
  • Vortex Break (ボルテックブレイク, Borutekku Bureiku):
    • Blade: Build channels the energy of a Fullbottle in his Drill Crusher and performs a powerful slash.
      • Unicorn: An energy projection resembling a unicorn's horn spins around the Drill Crusher as Build performs a powerful stab attack.
This form is exclusive to Raising the Hazard Level ~7 Best Matches~: First Chapter.

HawkGatling Hazard Form
KRBu-Buildhawkgatlinghazard

HawkGatling Hazard Form

"Taka! Gatling! Super Best Match! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Hazard Form transformation announcement[src]
Rider Statistics[70][71]
  • Rider Height: 197.5 cm
  • Rider Weight: 101 kg
Ability Parameters[70][71]
  • Punching Power: 19.4 t (right arm)/20.0 t (left arm)
  • Kicking Power: 27 t (right leg)/28.4 t (left leg)
  • Maximum Jump Height: 58.4 m
  • Maximum Running Speed: 100 m per 2.9 seconds

HawkGatling Hazard Form (ホークガトリングハザードフォーム, Hōku Gatoringu Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading HawkGatling Form with the Hazard Trigger. Build is armed with the Hawk Gatlinger in this form. He can also summon the Solstall Wings for flight if needed.

Finishers
  • Over Flow (オーバーフロー, Ōbāfurō): Build performs a series of blasts with the Hawk Gatlinger while flying around the enemy with the Solstall Wings.
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu): Build traps the enemy in a black cloud and performs a series of purple blasts with the Hawk Gatlinger.
This form is exclusive to Episode 22.

KaizokuRessya Hazard Form
KRBu-Buildkaizokuressyahazard

KaizokuRessya Hazard Form

"Kaizoku! Densya! Super Best Match! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Hazard Form transformation announcement[src]
Rider Statistics[72][73]
  • Rider Height: 197.5 cm
  • Rider Weight: 101 kg
Ability Parameters
  • Punching Power: 24 t (right arm)/25.4 t (left arm)
  • Kicking Power: 30 t (right leg)/27.6 t (left leg)
  • Maximum Jump Height: 55.2 m
  • Maximum Running Speed: 100 m per 1.3 seconds

KaizokuRessya Hazard Form (海賊レッシャハザードフォーム, Kaizoku Ressha Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading KaizokuRessya Form with the Hazard Trigger. Build is armed with the Kaizoku Hassyar in this form.

Finishers
  • Over Flow (オーバーフロー, Ōbāfurō): Build repeatedly punches the enemy with his HZ Deadly Gloves delivering purple shockwaves on impact.
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu):
Appearances: Build Episode 24, 35

KeyDragon Hazard Form
KRBu-Buildkeydragonhazard

KeyDragon Hazard Form

"Dragon! Lock! Super Best Match! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Hazard Form transformation announcement[src]
Rider Statistics[74][75]
  • Rider Height: 197.5 cm
  • Rider Weight: 101 kg
Ability Parameters[74][75]
  • Punching Power: 39.4 t (right arm)/33.8 t (left arm)
  • Kicking Power: 35.2 t (right leg)/48.2 t (left leg)
  • Maximum Jump Height: 66.4 m
  • Maximum Running Speed: 100 m per 2.5 seconds

KeyDragon Hazard Form (キードラゴンハザードフォーム, Kī Doragon Hazādo Fōmu) is Build's turbocharged super form accessed by upgrading KeyDragon Form with the Hazard Trigger. Build is armed with the Beat Closer in this form.

Finishers
  • Over Flow (オーバーフロー, Ōbāfurō): Build repeatedly punches the enemy with his HZ Deadly Gloves delivering purple shockwaves on impact.
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu):
Appearances: Build Episode 35

By using the FullFull RabbitTank Bottle alongside the Hazard Trigger, Build can upgrade the sleek, black Hazard Form into either RabbitRabbit Form or TankTank Form. The FullFull RabbitTank Bottle was designed to give Build an immense power boost over Hazard Form while suppressing the stimulus Over Flow that causes Build to go berserk. Build's weapon in these forms is the Fullbottle Buster.

The ending theme for both RabbitRabbit Form and TankTank Form is entitled "Ready Go!!".

RabbitRabbit Form
KRBu-Buildrabbitrabbit

RabbitRabbit Form

"Rabbit and Rabbit! Build up! Are you ready? Over Flow! (Techno pop music) Kurenai no speedy jumper! RabbitRabbit! Yabei! Haei![76]"
―Transformation announcement[src]
Rider Statistics[77][78]
  • Rider Height: 197.5 cm
  • Rider Weight: 106.2 kg
Ability Parameters[77][78]
  • Punching Power: 39.9 t
  • Kicking Power: 47.8 t
  • Base Jump Height: 88 m
    • Max Jump Height: 132 m
  • Base Running Speed: 100 m per 1.2 seconds
    • Maximum Running Speed: 100 m per 0.8 seconds

RabbitRabbit Form (ラビットラビットフォーム, Rabitto Rabitto Fōmu) is one of Build's upgraded super forms, based on the Rabbit Halfbody. It is accessed by upgrading RabbitTank Hazard Form with the FullFull RabbitTank Bottle, set to its Rabbit mode, hence known as the Crimson Speedy Jumper (紅のスピーディージャンパー, Kurenai no Supīdī Janpā).

In this form, Build can not only run faster, and jump higher than he could in RabbitTank Sparkling form, but he can also stretch his limbs at will. Strengthening materials inside the chest piece of RabbitRabbit allow the user to increase its reaction time, jumping height, running speed up to a maximum of 1.5x.

In RabbitRabbit Form, Build is armed with and protected by the Rapid Rabbit Shoulders (BLDラピッドラビットショルダー, BLD Rapiddo Rabitto Shorudā), the Speed Chest Armor (スピーディーチェストアーマー, Supīdī Chesuto Āmā), the arm-mounted Hop Pop Gauntlets (ホップポップガントレット, Hoppu Poppu Gantoretto) and the leg-mounted Jump Champ Leggers (ジャンプチャンプレガース, Janpu Chanpu Regāsu).

The Hop Pop Gauntlets and Jump Champ Leggers contain Dimension Springers (ディメンションスプリンガー, Dimenshon Supuringā) that enable long distance stretching.

On the back of RabbitRabbit Form is the cape-like Mufflerabbit Accelerator (マフラビットアクセラレーター, Mafura Bitto Akuserarētā), which enables Build to run around at supersonic speeds thanks to an inbuilt propulsion accelerating device.

Build Driver finisher
  • RabbitRabbit Finish (ラビットラビットフィニッシュ, Rabitto Rabitto Finisshu): Jumping into the air, Build stretches his leg towards the opponent, and pulling his body towards his foot, connects with the target, with the resulting impact sending his opponent flying.
Fullbottle Buster finishers
  • Fullbottle Break (フルボトルブレイク, Furubotoru Bureiku): Build channels the power of a single Fullbottle for either a powerful slash or a powerful shot.
  • Just Match Break (ジャストマッチブレイク, Jasuto Matchi Bureiku): Build channels the power of two Fullbottles for a powerful attack.
    • Buster Cannon Mode
      • Rabbit + Panda: Build fires a ball of red and white energy mixed together.
      • Rocket + Jet: Build fires a ball of cyan energy.
  • Miracle Match Break (ミラクルマッチブレイク, Mirakuru Matchi Bureiku): Build channels the power of three Fullbottles for a powerful attack.
    • Buster Cannon Mode
      • Rabbit + Panda + Taka: Build fires a ball of red and white energy mixed together that gives off orange energy shockwaves upon impact.
  • Ultimate Match Break (アルティメットマッチブレイク, Arutimetto Macchi Bureiku): Build channels the power of four Fullbottles for a powerful attack.
  • FullFull Match Break (フルフルマッチブレイク, Furu Furu Matchi Bureiku): Build channels the power of the FullFull RabbitTank Bottle for a powerful attack
    • Buster Blade Mode
      • Rabbit Mode: This finisher has two variations:
        • Build runs at the enemy at high speeds, and delivers a slash with the blade covered in red energy.
        • Build performs a 360 degree spinning slash covered in red energy that is capable of hitting multiple enemies.
Appearances: Build Episodes 27-36, 38-40, 45, Be The One, Build 49, Kamen Rider Prime Rogue

TankTank Form

KRBu-Buildtanktank

TankTank Form

KRBu-Buildtanktank (Tank Body)

TankTank Form (Transformed)

"Tank and Tank! Build up! Are you ready? Over Flow! (Techno rock music) Kōtetsu no blue warrior! TankTank! Yabei! Tuei![76]"
―Transformation announcement[src]
Rider Statistics[79][80]
  • Rider Height: 197.5 cm
  • Rider Weight: 145.3 kg
Ability Parameters[79][80]
  • Base Punching Power: 47 t
    • Maximum Punching Power: 70.5 t
  • Base Kicking Power: 53.7 t
    • Maximum Kicking Power: 80.55 t
  • Maximum Jump Height: 58 m
  • Maximum Running Speed: 100 m per 1.1 seconds

TankTank Form (タンクタンクフォーム, Tanku Tanku Fōmu) is one of Build's upgraded super forms, based on the Tank Halfbody. It is accessed by upgrading RabbitTank Hazard Form with the FullFull RabbitTank Bottle, set to its Tank mode, hence known as the Blue Warrior of Steel (鋼鉄のブルーウォーリアー, Kōtetsu no Burū Wōriā).

In this form, Build's armor becomes significantly denser and is covered in tank treads and turrets to boost his attacks and defenses. Strengthening materials inside the chest piece of TankTank allow the user to increase its punching and kicking power up to a maximum of 1.5x.

In TankTank Form, Build is armed with and protected by the BLD TankTank Shoulders (BLDタンクタンクショルダー, BLD Tanku Tanku Shorudā), the Warrior Chest Armor (ウォーリアチェストアーマー, Wōriā Chesuto Āmā), the arm-mounted Fight Might Gauntlets (ファイトマイトガントレット, Faito Maito Gantoretto) and the leg-mounted Dash Mash Leggers (ダッシュマッシュレガース, Dasshu Masshu Regāsu).

The Fight Might Gauntlets and Dash Mash Leggers contain Blue Tank Rollers (ブルータンクローラー, Burū Tanku Rōrā), which are the tank tread-like units on the forearms and shins, and enable high-speed cutting power.

Build Driver finisher
  • TankTank Finish (タンクタンクフィニッシュ, Tanku Tanku Finisshu):
Fullbottle Buster finishers
  • Fullbottle Break (フルボトルブレイク, Furubotoru Bureiku): Build channels the power of a single Fullbottle for a powerful attack.
    • Buster Cannon Mode
      • Spider: Build fires a blast of purple energy that transforms into a web to trap the target.
      • Magnet: Build fires a blue energy magnet that pulls enemies towards each other to the point where they implode.
      • Dryer: Build fires a ball of red energy that transforms into a stream of heat which continuously burns the target.
  • Just Match Break (ジャストマッチブレイク, Jasuto Matchi Bureiku): Build channels the power of two Fullbottles for a powerful attack.
  • Miracle Match Break (ミラクルマッチブレイク, Mirakuru Matchi Bureiku): Build channels the power of three Fullbottles for a powerful attack.
  • Ultimate Match Break (アルティメットマッチブレイク, Arutimetto Macchi Bureiku): Build channels the power of four Fullbottles for a powerful attack.
    • Buster Cannon Mode
      • Tank + Jet + Gatling + Rocket: Build fires a ball of blue, gray, and white energy with the images on Bottles mixed together that gives off cyan energy shockwaves upon impact.
  • FullFull Match Break (フルフルマッチブレイク, Furu Furu Matchi Bureiku): Build channels the power of the FullFull RabbitTank Bottle for either a powerful slash or a powerful shot.
    • Buster Cannon Mode
      • Tank Mode: This finisher has two variations:
        • Build's lower body transforms into a pair of tank treads, the cannons on his shoulder armor flips forward, and Build rolls around the battlefield while dealing out multiple continuous shots to its target, ending the barrage with a large blast of energy that gives off blue electricity.
        • Build fires a blue energy ball that creates shockwaves upon impact.
Appearances: Build Episodes 28-33, 35-36, 40, 43-44, Be The One, Build 48-49

Genius Form

KRBu-Buildgenius

Genius Form

KRBu-Buildgeniusoverflow

Genius Form with Hazard Trigger

"Genius! Are you ready? Kanzen muketsu no bottle yarō! Build Genius! Sugei! Monosugei!"
―Transformation announcement[src]

"Genius! Build up! Are you ready? Over Flow! Kanzen Muketsu no Bottle Yarō! Build Genius! Yabei! Sugei! Monosugei!"
―Alternate transformation announcement with Hazard Trigger[src]

Rider Statistics[81][82]
  • Rider Height: 196.4 cm
  • Rider Weight: 105.6 kg
Ability Parameters[81][82]
  • Punching Power: 55.7 t
  • Kicking Power: 61.1 t
  • Maximum Jump Height: 86.3 m
  • Maximum Running Speed: 100 m per 0.9 seconds

Genius Form (ジーニアスフォーム, Jīniasu Fōmu)[83] is Build's final form, accessed by using the Genius Fullbottle in the Build Driver. It is hence known as the Completely Flawless Bottle Guy (完全無欠のボトル野郎, Kanzen Muketsu no Botoru Yarō).

Genius Form is more balanced compared to RabbitRabbit Form and TankTank form, having a punching and kicking power lower than TankTank's maximum capabilities and a jumping height and running speed lower than RabbitRabbit's maximum capabilities. In this form Build was able to easily defeat Kamen Rider MadRogue. However, he has weaker punching and kicking power than all of Evol's forms and is surpassed by Evol Black Hole Form in all categories.

In this form Build is able to utilize bursts of extreme speed and his reaction time is heightened to the point where enemy attacks appear to him to be moving in slow motion. He is also able to utilize the powers and abilities of any of the 60 main Fullbottles. Build's most powerful asset in this form, however, is the ability neutralize Nebula Gas in its various forms, thanks to the Full Build Reactor (フルビルドリアクター, Furu Birudo Riakutā) located on the chest. He is able to neutralize the Nebula Gas in the cells of his opponents, as he was able to defeat Yoshiko Tajimi as the Owl Lost Smash without the risk of her dying due to overexposure to the gas. This was also seen when his attacks caused Kamen Rider MadRogue to collapse with his armor emitting electric sparks. In this form Build is also able to neutralize the essence of Lost Fullbottles, as when he defeats a Lost Smash, the Lost Fullbottle it used to transform turns completely black. This ability is also seen when Evolto tries to turn Sento into a Lost Smash with the Castle Fullbottle, but to no effect.

Even with the Hazard Trigger attached, Build can still fight without going on a destructive rampage. He also gains the ability to negate the Pandora Panel's effects on Lost Fullbottles. This is shown when Build's Genius Finish attack reverted the Hammer and Castle Lost Fullbottles back to their original state.

Genius Form is covered with 60 GN Fullbottles (GNフルボトル, GN Furubotoru), each one carrying an essence of one Fullbottle. Warm colored GN Fullbottles (red, magenta and orange) carry biotic essences (i.e. Rabbit, Dragon, Rose, etc.) while the cold dored ones carry abiotic essences (i.e. Tank, Lock, Helicopter, etc.). When executing a finisher, the GN Fullbottles will glow while their essences are carried by the Full Build Pipelines (フルビルドパイプライン, Furu Birudo Paipurain) running all over Genuis Form, feeding them into the Full Build Reactor before redistributing it over the body.

Build continues to wield the Fullbottle Buster in this form.

Build loses access to this form after the Genius Fullbottle's energy is absorbed in the process of uniting the black and white Pandora Panels.

Build Driver finishers
  • Genius Attack (ジーニアスアタック, Jīniasu Atakku): Build channels the energy of all 30 biotic Fulbottles, making the red, magenta, and orange parts of his body glow before delivering a punch covered in red energy.
  • Genius Break (ジーニアスブレイク, Jīniasu Bureiku): Build channels the energy of all 30 abiotic Fullbottles, making the blue, cyan, and violet parts of his body glow before delivering a side kick covered in blue energy that creates a shockwave upon impact and sends the enemy flying.
  • Genius Finish (ジーニアスフィニッシュ, Jīniasu Finisshu): This finisher has three variations:
    • Build performs an enhanced version of RabbitTank Form's Vortex Finish, with the graph being rainbow colored and Build emitting rainbow-colored gas in order to accelerate into the enemy.
    • Build performs a side kick covered in red, blue, and gold sparks of energy that creates a swirling, rainbow-colored shockwave upon impact.
    • Build delivers a punch that creates a swirling, rainbow-colored shockwave upon impact.
Fullbottle Buster finishers
  • FullFull Match Break (フルフルマッチブレイク, Furu Furu Matchi Bureiku): Build channels the power of the FullFull RabbitTank Bottle for a powerful attack.
    • Buster Blade Mode: Build unleashes a green energy slash that travels through the air.
    • Buster Cannon Mode: Build fires a rainbow energy ball that creates shockwaves upon impact.

Build Genius Form's ending theme is entitled "Build up", with "Law of the Victory" featuring as the ending theme when Genius Form teams up with Kamen Rider Cross-Z Magma, Kamen Rider Grease, and Kamen Rider Rogue.

Appearances: Build Episodes 39-45, Be The One, Build 46-48

In any form that uses the Gold Rabbit Fullbottle, Build is armed with the GLD Rabbit Foot Shoes (GLDラビットフットシューズ, GLD Rabitto Futto Shūzu) on his left leg for increased jumping.

Trial Form RabbitDragon
KRBu-Buildrabbitdragon

RabbitDragon Form

"Rabbit! Dragon! Are you ready? (Funky music) Best Match!"
―RabbitDragon's transformation announcement[src]
Rider Statistics[84][85]
  • Rider Height: 196 cm
  • Rider Weight: 93.1 kg
Ability Parameters[84][85]
  • Punching Power: 47.8 t (right arm)/55.8 t (left arm)
  • Kicking Power: 61.3 t (right leg)/54.5 t (left leg)
  • Maximum Jump Height: 79.8 m
  • Maximum Running Speed: 100 m per 1.1 seconds

Trial Form RabbitDragon (トライアルフォーム(ラビットドラゴン), Toraiaru Fōmu Rabitto Doragon), also known as RabbitDragon Form (ラビットドラゴンフォーム, Rabitto Doragon Fōmu), is Build's gold and silver Trial Form accessed through the Gold Rabbit and Silver Dragon Fullbottles,themed after a rabbit and a dragon.

In this form, Build's punching and kicking power is equivalent to Genius Form, while his maximum jumping height and running speed are slightly lower. Overall, RabbitDragon Form is a good alternative to Genius Form, which Sento could not use due to the Genius Fullbottle being drained of its energy after uniting the Black and White Pandora Panels, and was able to destroy Evolto in his Ultimate State.

Although RabbitDragon Form is a Trial Form, the strong feelings between Sento and Ryuga caused the Build Driver to reproduce the Best Match announcement after the transformation was complete.

As a mismatched form, this form's finisher is the Vortex Attack (ボルテックアタック, Borutekku Atakku): Build performs an alternate version of RabbitTank Form's Vortex Finish with gold and silver energy. Build also reverts to RabbitTank Form in the process.

This form is exclusive to Kamen Rider Build Episode 49.

Before this form debuted in the series, it was teased in a trailer for Kamen Rider Build: Be The One before Cross-ZBuild Form was revealed.

These forms are accessed through Fullbottles either not used or unavailable in the main series and are exclusive to specials or spin-off installments.

KumaTV Form
KRBu-Buildkumatv

KumaTV Form

"Kuma! Televi! Best Match! Are you ready? (Upbeat brass music) Hachimitsu high vision! KumaTV! Yeah!"
―KumaTV's transformation announcement[src]
Rider Statistics[86]
  • Rider Height: 189 cm
  • Rider Weight: 124 kg
Ability Parameters[86]
  • Punching Power: 25.7 t (right arm)/14.7 t (left arm)
  • Kicking Power: 17.9 t (right leg)/16.6 t (left leg)
  • Maximum Jump Height: 30.7 m
  • Maximum Running Speed: 100 m per 6.8 seconds

KumaTV Form (クマテレビフォーム, Kuma Terebi Fōmu) is Build's marigold and gunmetal gray Best Match form accessed with the Kuma and TV Fullbottles, hence known as the Honey High Vision (はちみつハイビジョン, Hachimitsu Hai Bijon). It is a Hokuto Best Match, and is themed after a bear and a television.

In this form, Build gains assistance from an AI in the suit known as Televi-san (てれびさん, Terebisan). He can also temporarily enlarge himself simply by projecting an energy barrier in the shape of the bear crossing sign on his chest, and then running through it.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build throws a ball of honey-like energy at the enemy that solidifies in front of it before running up to the enemy for a slashing maneuver with his claws.

This form is exclusive to Kamen Rider Build: Birth! KumaTV!! VS Kamen Rider Grease!.

Trial Forms
"Kuma! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

SameBike Form
KRBu-Buildsamebike

SameBike Form

"Same! Bike! Best Match! Are you ready? (Surfer music) Dokusou hunter! SameBike! Yeah!"
―SameBike's transformation announcement[src]
Rider Statistics[87]
  • Rider Height: 194 cm
  • Rider Weight: 110.5 kg
Ability Parameters[87]
  • Punching Power: 16.7 t (right arm)/16.8 t (left arm)
  • Kicking Power: 22.4 t (right leg)/20.7 t (left leg)
  • Maximum Jump Height: 41.2 m
  • Maximum Running Speed: 100 m per 4.1 seconds

SameBike Form (サメバイクフォーム, Same Baiku Fōmu) is Build's navy and scarlet Best Match form accessed with the Same and Bike Fullbottles, hence known as the Solo-running Hunter (独走ハンター, Dokusō Hantā). It is a Seito Best Match, and is themed after a shark and the Machine Builder.

In this form, Build has the ability to use echolocation in order to detect invisible foes and can summon several energy projections of the Machine Builder that autonomously attack the enemy.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu): Build rides the Machine Builder like a surfboard as a projection of a shark launches him and the bike into the enemy.

This form is exclusive to Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Final Chapter.

Trial Forms
"Same! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

Cross-ZBuild Form
KRBu-Buildcrosszbuild

Cross-ZBuild Form

"Cross-ZBuild! Are you ready? Rabbit! Dragon! Be the one! Cross-ZBuild! Yeahhh! Yeahhh!"
―Cross-ZBuild's transformation announcement[src]
Rider Statistics[88]
  • Rider Height: 197.6 cm
  • Rider Weight: 111.1 kg
Ability Parameters
  • Punching Power: 55 t (right arm)/64.2 t (left arm)
  • Kicking Power: 70.5 t (right leg)/62.7 t (left leg)
  • Maximum Jump Height: 91.8 m
  • Maximum Running Speed: 100 m per 0.8 seconds

Cross-ZBuild Form (クローズビルドフォーム, Kurōzu Birudo Fōmu) is Build's fusion form, combining the powers of Build and Cross-Z and fusing Sento and Ryuga into one body. It is accessed using the Cross-ZBuild Can. In this form, Build's stats exceed those of Genius Form, making it his strongest form. Cross-ZBuild can summon the golden mechanical Best Match Rabbit (ベストマッチラビット, Besuto Matchi Rabitto) and the blue energy Best Match Dragon (ベストマッチドラゴン, Besuto Matchi Doragon) to assist him in combat.

Cross-ZBuild Form is composed of the following parts:

  • BLD Cross-ZBuild Head (BLDクローズビルドヘッド, BLD Kurōzu Birudo Heddo): The helmet.
    • Cross-Z Head Armor (クローズヘッドアーマー, Kurōzu Heddo Āmā): The blue head armor. It has the property of improving durability by optimizing the internal structure and density balance each time it is attacked. Additionally, a balancer is built in to assist Cross-ZBuild's defense movements so that the enemy's attack can be avoided with minimal movement.
    • Build Head Armor (ビルドヘッドアーマー, Birudo Heddo Āmā): The red head armor. High-density and high-strength materials are used, allowing Cross-ZBuild to lightly catch the onslaught of strong enemies. In addition, a strengthening device that utilizes the characteristics of the Gold Rabbit Full Bottle is incorporated, and the movement speed and reaction speed can be doubled.
    • Best Match Signal (ベストマッチシグナル, Besuto Matchi Shigunaru): The tuning device on the forehead. It synchronises the consciousness of the two transformants and supports them so that their behaviour isn't hindered. Additionally, it is possible to aggregate battle data in real time and accurately grasp the abilities of yourself and the enemy. It also manages the condition of the whole body, and if there is a damaged part it will automatically perform emergency repair.
    • CB Right Eye Dragon (CBライトアイドラゴン, CB Raito Ai Doragon): The right eye. It increases Cross-ZBuild's reaction speed and increases their accuracy and avoidance rate in combat. The surface is covered with a clear shield with excellent impact resistance to protect the visual sensor from intense combat.
    • CB Dragon Face Module (CBドラゴンフェイスモジュール, CB Doragon Feisu Mojūru): A heat generation enhancement device installed on the side of the CB Right Eye Dragon. It heats the armor of the whole body to the melting point, increasing the power of the special move by several times. It mainly works when Cross-ZBuild's emotions are excited.
    • CB Left Eye Rabbit (CBレフトアイラビット, CB Refuto Ai Rabitto): The left eye. It increases Cross-ZBuild's reaction speed and accuracy in combat. A special olfactory sensor is incorporated to find enemies hidden in the shadows.
    • CB Ear Face Module (CBイヤーフェイスモジュール, CB Iyā Feisu Mojūru): The 'rabbit ear'. A hearing enhancement device installed on the head of Kamen Rider Build. By catching the signs and slight movements of the enemy, the next action is predicted and a quick counterattack is possible. It can also summon the golden Best Match Rabbit unit to the vicinity to act as support during combat.
  • Build Chest Armor (ビルドチェストアーマー, Birudo Chesuto Āmā): The red chest armor. High-density and high-strength material is used, and weight reduction is also applied to improve athletic performance. Additionally, a strengthening device that utilizes the characteristics of the Gold Rabbit Full Bottle is incorporated, and Cross-ZBuild's movement speed and reaction speed can be doubled.
  • Cross-Z Chest Armor (クローズチェストアーマー, Kurōzu Chesuto Āmā): The blue chest armor and vest section. It has the role of converting the components of the Cross-ZBuild Can loaded in the Build Driver into luminescent enhanced particles, dramatically increasing the attack performance of each part of the whole body. It can also convert the ingredients of the Silver Dragon Full Bottle into the blue flame energy body "Best Match Dragon" and fight together.
  • BLD Unlimited Suit (BLDアンリミテッドスーツ, BLD Anrimiteddo Sūtsu): The shock-resistant bodysuit. Along with protecting the wearer’s body, there is a limiter installed that can be released to bring out full physical ability.
  • CB Rabbit Shoulder (CBラビットショルダー, CB Rabitto Shorudā): The right shoulder. It optimizes the movement of the arm to improve Cross-ZBuild's attack speed and strengthens the power of slashing when using weapons. It is also possible to rotate the Build Driver's Vortex Lever at a speed several tens of times faster than before, greatly increasing the power of the special move.
  • CB Dragon Shoulder (CBドラゴンショルダー, CB Doragon Shorudā): The right shoulder. It optimizes the movement of the arm and increasing the speed and power of the fighting attack to the same level as the enemy.
  • Build Rush Arm (ビルドラッシュアーム, Birudo Rasshu Āmu): The right arm. It's agility and controllability have been enhanced to the utmost limit, and it is possible to continue hitting the enemy with a super-fast jab that does not allow a counterattack using the leg-mounted dimensional telescopic spring "CB Dimension Springer".
  • CB Rabbit Fight Glove (CBラビットファイトグローブ, CB Rabitto Faito Gurōbu): The right hand. It has a function to converge the impact of a punch attack to a specific part inside the destruction target, and can deal a certain amount of damage regardless of the armor strength of the enemy.
  • Cross-Z Rush Arm (クローズラッシュアーム, Kurōzu Rasshu Āmu): The left hand. It specializes in cutting attacks thanks to the sharp blue CB Fang Blades (CBファングオブレイド, CB Fanguo Bureido), and can also use a blasting punch with luminescent-enhanced particles to ward off surrounding enemies.
  • Dragon Fight Glove (CBドラゴンファイトグローブ, CB Doragon Faito Gurōbu): The left hand. Firm grips will super-harden, increase the destructive power of hitting attacks, and protects the fist from recoil damage. The power of the attack increases to respond to the passion of the transformant, and the one-shot deadly finish blow can also be used.
  • CB Vector Robes (CBベクターローブ, CB Bekutā Rōbu): The robes/special propulsion unit. It has a built-in propulsion accelerator that uses a luminescence enhancer, and can fly around the battle area at high speed.
  • Cross-Z Rush Leg (クローズラッシュレッグ, Kurōzu Rasshu Reggu): The right leg. It is good at ambush knee drops from the sky that makes use of its jumping power, and it is also possible to scavenge surrounding enemies with a blast kick wearing luminescent enhanced particles.
  • CB Dragon Foot Shoe (CBドラゴンフットシューズ, CB Doragon Futto Shūzu): The right foot. Equipped with a footwork optimization function, it is possible to play with enemies with lean movements such as sliding on the ground. The power of the attack increases so as to respond to the passion of the transformant.
  • Build Rush Leg (ビルドラッシュレッグ, Birudo Rasshu Reggu): The left leg. It is highly agile and specializes in multi-stage high-speed high jumps by using the dimensional telescopic spring CB Dimension Springer (CBディメンションスプリンガー, CB Dimenshon Supuringā). It is also possible to freely expand and contract his legs and hit a kick at a distant enemy.
  • CB Rabbit Foot Shoe\CBラビットフットシューズ (CB Rabitto Futto Shūzu): The left foot. It is good at light footwork, and it is possible to launch a kick attack that interweaves acrobatic actions such as the Moonsault (ムーンサルト, Mūnsaruto).

This form's finisher is the Love and Peace Finish (ラブ&ピース, Rabu Ando Pīsu Finisshu): Build use the Best Match Rabbit to jump high into air as he performs a Rider Kick, before Best Match Dragon flies behind him, breaths fire, sending him high into the air before a golden and silver double helix energy chart securing the enemy before delivering an another Rider Kick whilst riding the chart's line.

Appearances: Kamen Rider Build: Be The One, Kamen Rider Build: Final Stage

SpiderCooler Form
KRBu-Buildspidercooler

SpiderCooler Form

"Spider! Reizoko! Best Match! Are you ready? (Drum and bass music) Reikyaku no trap master! SpiderCooler! Yeah!"
―SpiderCooler's transformation announcement[src]

SpiderCooler Form (スパイダークーラーフォーム, Supaidā Kūrā Fōmu) is Build's purple and white Best Match form accessed with the Spider and Reizoko Fullbottles, hence known as the Cooling Trap Master (冷却のトラップマスター, Reikyaku no Torappu Masutā). It is a Hokuto Best Match, and is themed after a spider and a refrigerator.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Spider! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

BatEngine Form
KRBu-Buildbatengine

BatEngine Form

"Bat! Engine! Best Match! Are you ready? (Gothic rock music) Ankoku no kidō-ō! BatEngine! Yeah!"
―BatEngine's transformation announcement[src]

BatEngine Form (バットエンジンフォーム, Batto Enjin Fōmu) is Build's purple and scarlet Best Match form accessed with the Bat and Engine Fullbottles, hence known as the Dark Mobility King (暗黒の機動王, Ankoku no Kidō-ō). It is a Seito Best Match, and is themed after a bat and an engine.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Bat! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

HachiMarine Form
KRBu-Buildhachimarine

HachiMarine Form

"Hachi! Sensuikan! Best Match! Are you ready? (Rock music) Shinkai no shigotonin! HachiMarine! Yeah!"
―HachiMarine's transformation announcement[src]

HachiMarine Form (ハチマリンフォーム, Hachi Marin Fōmu) is Build's electric yellow and skyblue Best Match form accessed with the Hachi and Sensuikan Fullbottles, hence known as the Deep Sea Worker (深海の仕事人, Shinkai no Shigotonin). It is a Seito Best Match, and is themed after a bee and a submarine.

In this form, Build gains a stinger on his right pointer finger.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Hachi! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

SaiDryer Form
KRBu-Buildsaidryer

SaiDryer Form

"Sai! Dryer! Best Match! Are you ready? (Ukulele music) Chō netsu tairiku! SaiDryer! Yeah!"
―SaiDryer's transformation announcement[src]

SaiDryer Form (サイドライヤーフォーム, Sai Doraiyā Fōmu) is Build's grey and scarlet Best Match form accessed with the Sai and Dryer Fullbottles, hence known as the Super Heating Continent (超熱大陸, Chō Netsu Tairiku). It is a Seito Best Match, and is themed after a rhinoceros and a hair dryer.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Sai! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

GoldScorpion Form
KRBu-Buildgoldscorpion

GoldScorpion Form

"Scorpion! Gold! Best Match! Are you ready? (Egyptian-themed rock music) Kōki naru dokubari! GoldScorpion! Yeah!"
―GoldScorpion's transformation announcement[src]

GoldScorpion Form (ゴールドスコーピオンフォーム, Gōrudo Sukōpion Fōmu) is Build's maroon and gold Best Match form accessed with the Scorpion and Gold Fullbottles, hence known as the Noble Stinger (高貴なる毒針, Kōki naru Dokubari). It is themed after a scorpion and gold.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Scorpion! (Abiotic Fullbottle name)! Are you ready?"
―Trial Forms' transformation announcement[src]


These forms have yet to appear in any episode, movie, or special.

Kamen Rider Metal Build
KRBu-Metalbuild

Kamen Rider Metal Build

"Tank! Tank! Are you ready? (Techno rock music) Uncontrol switch! Black Hazard! Yabei!"
―Transformation announcement[src]
Rider Statistics[89]
  • Rider Height: 197.5 cm
  • Rider Weight: 101 kg
Ability Parameters
  • Punching Power: 49.1 t
  • Kicking Power: 55.3 t
  • Maximum Jump Height: 63.3 m
  • Maximum Running Speed: 100 m per 1.2 seconds

Keiji transforms into Kamen Rider Metal Build (仮面ライダーメタルビルド, Kamen Raidā Metaru Birudo) by using the Metal TankTank Fullbottles in the Build Driver with the Hazard Trigger attached. Due to using two abiotic Fullbottles, Metal Build is incredibly durable and much more powerful than Build's normal forms. Keiji doesn't go berserk in this form, as he uses two identical Fullbottles in the same fashion as the FullFull RabbitTank Bottle.

Build Driver finishers
  • Hazard Attack (ハザードアタック, Hazādo Atakku): Metal Build jumps into the air before crashing into the target with a double knee drop. He then creates an energy tank tread that grinds the enemy into the ground.
  • Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu): Metal Build performs a roundhouse kick motion towards the opponent, creating a tank track that flies into the target and grinds against them, acting like a chainsaw. This attack can strike multiple opponents.
Appearances: Build NEW WORLD: Kamen Rider Grease

Phantom Build
KRBu-Phantombuild

Phantom Build

Rider Statistics[89]
  • Rider Height: 197.5 cm
  • Rider Weight: 121.9 kg
Ability Parameters
  • Punching Power: 57.8 t
  • Kicking Power: 63.4 t
  • Maximum Jump Height: 70.5 m
  • Maximum Running Speed: 100 m per 1 second

Upon merging with the white Last Pandora Panel, Kamen Rider Metal Build combines with a Phantom Crusher to form Phantom Build (ファントムビルド, Fantomu Birudo). In contrast to the durability of Metal Build's normal form, Phantom Build demonstrates extraordinary speed.

This form's finisher is the Hazard Finish (ハザードフィニッシュ, Hazādo Finisshu): Phantom Build launches a volley of missiles from his back before performing two consecutive roundhouse kicks towards the opponent, creating a tank track that flies into the target.

Appearances: Build NEW WORLD: Kamen Rider Grease

These Forms are exclusive to Kamen Rider Battle: Ganbarizing.

UniRaser Form
KRBu-Builduniraser

UniRaser Form

"Unicorn! Keshigomu! Best Match! Are you ready? (Piano music) Ikkaku shōkyo! UniRaser! Yeah!"
―UniRaser's transformation announcement[src]

UniRaser Form (ユニレイサーフォーム, Yuni Reisā Fōmu) is Build's azure and white Best Match form accessed with the Unicorn and Keshigomu Fullbottles, hence known as the One Horned Erasure (一角消去, Ikkaku Shōkyo). It is is a Hokuto Best Match, and themed after a unicorn and an eraser.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Unicorn! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

TurtleWatch Form
KRBu-Buildturtlewatch

TurtleWatch Form

"Turtle! Watch! Best Match! Are you ready? (Rock music) Toki o kakeru katchū! TurtleWatch! Yeah!"
―TurtleWatch's transformation announcement[src]

TurtleWatch Form (タートルウォッチフォーム, Tātoru Wocchi Fōmu) is Build's green and white Best Match form accessed with the Turtle and Watch Fullbottles, hence known as the Armored Time Hopper (時を駆ける甲冑, Toki o Kakeru Katchū). It is a Hokuto Best Match, and is themed after a turtle and a watch.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

This form was intended to be used by Build in episode 21, though the scene was cut before the transformation was finished.

Trial Forms
"Turtle! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

BeetleCamera Form
KRBu-Buildbeetlecamera

BeetleCamera Form

"Kabutomushi! Camera! Best Match! Are you ready? (Tropical rock music) Mitsurin no scoop king! BeetleCamera! Yeah!"
―BeetleCamera's transformation announcement[src]

BeetleCamera Form (ビートルカメラフォーム, Bītoru Kamera Fōmu) is Build's orange and blue Best Match form accessed with the Kabutomushi and Camera Fullbottles, hence known as the Scoop King of the Forest (密林のスクープキング, Mitsurin no Sukūpu Kingu). It is a Hokuto Best Match, and is themed after a rhinoceros beetle and a camera.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Kabutomushi! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

DogMic Form
KRBu-Builddogmic

DogMic Form

"Dog! Mic! Best Match! Are you ready? (Heavy metal music) Iyashi no daibakuon! DogMic! Yeah!"
―DogMic's transformation announcement[src]

DogMic Form (ドッグマイクフォーム, Doggu Maiku Fōmu) is Build's sienna and silver Best Match form accessed with the Dog and Mic Fullbottles, hence known as the Great Roar of Comfort (癒しの大爆音, Iyashi no Daibakuon). It is a Hokuto Best Match, and is themed after a dog and a microphone.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Dog! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]

MerryChristmas Form
KRBu-Buildmerrychristmas

MerryChristmas Form

"Santa Claus! Cake! Best Match! Are you ready? (Christmas music) Seinaru shisha! MerryChristmas! Yeah!"
―MerryChristmas's transformation announcement[src]

MerryChristmas Form (メリークリスマスフォーム, Merī Kurisumasu Fōmu) is Build's red and cream Best Match form accessed with the Santa Claus and Cake Fullbottles, hence known as The Holy Envoy (聖なる使者, Seinaru Shisha). It is a Hokuto Best Match, and is themed after Santa Claus and a cake.

As a Best Match, this form's finisher is the Vortex Finish (ボルテックフィニッシュ, Borutekku Finisshu).

Trial Forms
"Santa Claus! (Abiotic Fullbottle name)! Are you ready? (Funky music)"
―Trial Forms' transformation announcement[src]