Sento Kiryu

Sento Kiryu (桐生 戦兎), born Taro Satou (佐藤 太郎), is a genius theoretical physicist who experiments with Fullbottles to further enhance his abilities as Kamen Rider Build (仮面ライダービルド) to fight against the evil Smash organisms.

History
Born Taro Sato, he was friends with Tatsuya Kishida during middle school and formed a band called Lynks with him in their adulthood. However on September 5, Taro was kidnapped by Faust where Blood Stalk was deemed responsible for his memory loss, with a single memory left behind which detailed the experiments done on him by Night Rogue. Taro later escaped with no memory of his past and was found outside the café Nascita by its owner Soichi Isurugi. With no identification, he was given the name Sento Kiryu and taken into Isuguri's care, hidden in the secret basement laboratory inside Nascita. At some point with his genius intellect intact, Sento created the Build Driver and purified Fullbottles, which he used to become Kamen Rider Build. With his new powers, Sento began fighting the Smash, hoping to find answers to his past.

Meeting Ryuga
After about a year of fighting as Build, Sento had gained some notoriety as the Kamen Rider. However, Sento's search was left at a standstill, as the Smash had no memories of their own experiments upon returning to human form. Meanwhile, Soichi, growing impatient with Sento's freeloading, directed him to a mid-level job at Touto Institute of Advanced Matter Physics.

Sento's first lead came in the form of Ryuga Banjyou, an ex-fighter and wanted fugitive. Alerted by Ryuga's Smash energy readings, Sento followed and eventually apprehended him. Much to his shock, Ryuga had just escaped from the labs where Sento had been experimented on, and had all his memories intact. The two were interrupted by Strong Smash, who attempted taking Ryuga away before Sento defeated it as Build. The Touto government quickly arrived and attempted to take Ryuga back into custody. Believing Ryuga's claim that he had been framed, Build helped Ryuga escape from the government, making Build a fugitive as well.

Burn Smash Incident and Meeting Night Rouge
Sento hides Ryuga in the secret lab, with Soichi scolding Sento for committing a felony. Sento explained that Ryuga was the 'best match' to his memories as they are both experimented by the same scientist group. On top of that, with exception of the location of the underground lab, Ryuga still had his memories intact. Sento deduced that Ryuga might lead him to the bat man and starts questioning him, but was put to a pause due to a Smash alert (a false trail to lure Build out).

Sento returned to discover Ryuga escaped, later discovering Ryuga's fiancé, Kasumi to have also been abducted by the scientists as well. Ryuga choked him into unconsciousness from getting him involved, but managed to catch up and was too late seeing that Kasumi was already transformed into Burn Smash. Then Night Rogue appeared, where Sento fought to demand answers for his experimentation, but responded that he cared less about every human subject his affiliation experimented. Night Rogue disappeared after delivering the bad news: Kasumi's body was too weak to be restored, and removing her Smash essence would be fatal. Realizing that Kasumi cannot be saved despite Ryuga's pleas, Sento calculated the only way to end her suffering by separating her consciousness long enough for her and Ryuga to say their goodbyes. Ryuga broke down with grief with nothing left to fight for until Sento reminded him Kasumi's life will be for nothing if he gave up and surrender. Sento returned to the lab where Ryuga followed thanked him for the latter, and deciding to cooperate in discovering the truth behind the scientists.

Other Appearances
Seeking a sample of Ex-Aid's essence, Build mistakenly intercepted Kamen Rider Genm while he was fighting through the Bugster Virus hordes of Gamedeus Cronus. Switching to the GorillaMond Form to engage him, only after eliminating one of Genm's lives did Build realize that he was not Ex-Aid and promptly took his leave after identifying himself to Dan. Inspired by this encounter, Dan created a Rider Gashat based on Build, the latest in his collection of those of the Heisei Riders, which Emu Hojo snatched from his hand and activate it.

Personality
"You know, in spite of how it may seem, I'm actually a pacifist."

- Build to Genm Sento is a highly intelligent and sarcastic young man: He likes to praise himself for his works, and has a somewhat child-like curiosity when learning new things, such as when he first sees the Pandora Box. Additionally, when he gets excited, a part of his hair sticks up. On the other hand, Sento is generally composed and calm while fighting.

But when Sento is not composed, he immediately rushes to settle things as seen when he finally met Night Rogue, even telling that he didn't care to know his name when Night Rogue introduced himself, and attacking Night Rogue carelessly. However, rage also enabled Sento to bring his ability as Build to higher potential, shown when he single-handedly manage to injure Blood Stalk. Blood Stalk comments that both Sento and Banjou were exposed to the same Nebula Gas amount to turn people as Smash, thereby classified them as Hazard.

Despite his eccentricity, Sento is a honorable hero. During his job as a Kamen Rider, he always upholds heroism without expecting anything in return.

Sento has a couple of catchphrases. Before he transforms, he says "Now, shall we begin the experiment?" (さあ、実験を始めようか？). After transforming, he says "The laws of victory have been decided." (勝利の法則は決まった).

Powers and Abilities

 * Nebula Gas Compatible Physiology: Sento has undergone an experiment from Faust which injected him with a certain amount of Nebula Gas. However, instead of mutating into a Smash, the gas retained his body without side affects aside from memory loss. According to Blood Stalk, these subjects have better quality than Smashes. This is the reason of why only Sento can utilize the Build Driver to transform into Kamen Rider Build.
 * Genius-Level Intellect: Sento's most defining trait is his intelligence. He has an advanced knowledge of physics, and developed almost all of Build's accessories on his own.
 * Genius Physicist: Sento has an advanced knowledge of physics, having finished a difficult physics test with perfect results. This proves a significant asset in battle, which Sento incorporates into his fighting technique.
 * Genius Engineer: Sento has built the majority, if not all, of Build's accessories on his own. Some of Claw's gear like the ClawsDragon was also built by Sento.
 * Fullbottle Augmentation: By using a Fullbottle in his hand without transforming, Sento can gain abilities based on said Fullbottle's traits:
 * Rabbit: Allows Sento to gain fast reflexes. First used to defeat Ryuga Banjyou in a one-on-one fight.
 * Gorilla: Allows Sento to perform fiery punches. First used to fight Ryuga Banjyou.

Weaknesses

 * Narcissism: Sento has overwhelming confidence in his own skills, so he tends to be proud of his own achievements and look down on others (especially anyone who relies on his inventions), which contributes to his prideful personality. Sento often relies on his own skills to solve problems and never expects sudden assistance from others, so when it happens, he tends to either be surprised or turns them down. Also Sento can be easily caught off guard when he accomplishes anything or witnesses something unexpected and new which excites him, due to his reliance on his intellect. In this state, he is vulnerable to any surprise attacks.
 * Desperate Curiosity: Sento can be easily attracted to anything that is mysterious and interesting and tends to do a total discovery for it, such as new innovations and anything that brings him closer to uncovering his past. This will continue until either he reaches a conclusion or someone forcibly stops him during progress.

Forms
Sento sets two different Fullbottles into the Build Driver and turns the crank to transform into Kamen Rider Build. 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), using different combinations of Fullbottles. However, each one has a Best Match (ベストマッチ) 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.

Build initiates a finishing attack by turning the Build Driver's Vortex Crank again. The finisher of all Trial Forms is called the Vortex Attack (ボルテックアタック), while the finisher of all Best Matches is called the Vortex Finish (ボルテックフィニッシュ).

{{#tag:tabber| Standard= {{#tag:tabber| Rabbit= {{#tag:tabber| Tank=  RabbitTank Form {{Quote|Rabbit! Tank! Best Match! Are you Ready? Hagane no Moonsault! RabbitTank! Yeahhh!|RabbitTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 {{nihongo|Moonsault of Steel|鋼のムーンサルト|Hagane no Mūnsaruto}}. It is themed after a rabbit and a tank.
 * Rider Height: 196.0 cm
 * Rider Weight: 99.0 kg
 * Punching Power: 9.9 tons (right arm)/17.0 tons (left arm)
 * Kicking Power: 23.7 tons (right leg)/17.8 tons (left leg)
 * Maximum Jump Height: 55.0 m
 * Maximum Running Speed: 100 m. per 2.9 sec.

RabbitTank is considered to be the most well balanced; having a good amount of power and agility in all of his Ability Perimeters, thus making it Build's default form, despite it being capable of initiating transformation with any set of Build's Fullbottles.

This form's weapon is the Drill Crusher.

As a Best Match, this form has two finishers:
 * Build Driver finisher:
 * {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}: 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. What this means exactly is not yet known.
 * Drill Crusher finisher:
 * {{nihongo|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.
 * Rabbit: Build performs a red energy slash.
 * Gun: 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.

Appearances: Ex-Aid Episode 44, True Ending, Build Episodes 1-2, Transformation Course (Kamen Rider Build), Build 3, 5-7, Heisei Generations FINAL: Build & Ex-Aid with Legend Rider {{-}} {{!}}-{{!}} Soujiki=  RabbitSoujiki Form {{Quote|Rabbit! Soujiki! Are you Ready?|RabbitSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height: 196.0 cm
 * Rider Weight: 93.7 kg
 * Punching Power: 7.9t (right arm)/5.7t (left arm)
 * Kicking Power: 9.6t (right leg)/14.2t (left leg)
 * Maximum Jump Height: 38.4m
 * Maximum Running Speed: 100m. per 3.9 sec

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

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 Perimeters being decreased from RabbitTank.

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

Appearances: Build Episode 2 {{-}} {{!}}-{{!}} Gatling=  RabbitGatling Form {{Quote|Rabbit! Gatling! Are you Ready?|RabbitGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height: 196.0 cm
 * Rider Weight: 95.0 kg
 * Punching Power: 7.9 t (right arm)/8.0 t (left arm)
 * Kicking Power: 10.8 t (right leg)/14.2 t (left leg)
 * Maximum Jump Height: 37.7m
 * Maximum Running Speed: 100m. per 6.2 sec

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode 4 {{-}} {{!}}-{{!}} Diamond=  RabbitDiamond Form {{Quote|Rabbit! Diamond! Are you Ready?|RabbitDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|RabbitDiamond Form|ラビットダイヤモンドフォーム|Rabitto Daiyamondo Fōmu}} is Build's red and cyan Trial Form accessed through the Rabbit and Diamond Fullbottles, themed after a rabbit and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic=  RabbitComic Form {{Quote|Rabbit! Comic! Are you Ready?|RabbitComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|RabbitComic Form|ラビットコミックフォーム|Rabitto Komikku Fōmu}} is Build's red and yellow Trial Form accessed through the Rabbit and Comic Fullbottles, themed after a rabbit and a comic book.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Rocket=  RabbitRocket Form {{Quote|Rabbit! Rocket! Are you Ready?|RabbitRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|RabbitRocket Form|ラビットロケットフォーム|Rabitto Roketto Fōmu}} is Build's red and light blue Trial Form accessed through the Rabbit and Rocket Fullbottles, themed after a rabbit and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha=  RabbitShoubousha Form {{Quote|Rabbit! Shoubousha! Are you Ready?|RabbitShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|RabbitShoubousha Form|ラビットショウボウシャフォーム|Rabitto Shōbōsha Fōmu}} is Build's red and scarlet Trial Form accessed through the Rabbit and Shoubousha Fullbottles, themed after a rabbit and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Gorilla= In any form that uses the Gorilla Fullbottle, Build is armed with the {{nihongo|Muscle Glove|マッスルグローブ|Massuru Gurōbu}} on his right arm for enhanced punching. {{#tag:tabber| Diamond=  GorillaMond Form {{Quote|Gorilla! Diamond! Best Match! Are you Ready? Kagayaki no Destroyer! GorillaMond! Yeahhh!|GorillaMond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 {{Nihongo|Shining Destroyer|輝きのデストロヤー|Kagayaki no Desutoroyā}}. It is themed after a gorilla and a diamond.
 * Rider Height: 189.0 cm
 * Rider Weight: 112.0 kg
 * Punching Power: 25.9 tons (right arm)/15.8 tons (left arm)
 * Kicking Power: 17.3 tons (right leg)/16.5 tons (left leg)
 * Maximum Jump Height: 32.5 m
 * Maximum Running Speed: 100 m. per 8.4 sec.

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 it's left arm, but it lacks Kicking Power and agility compared to RabbitTank. His left arm can convert inorganic objects, or even weakened enemies, into diamonds.

As a Best Match, this form's finisher is the {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}: This finisher has two variations:
 * Build creates a gust full of diamonds and uses the Muscle Glove to punch them at the enemy. The diamond then creates a tornado that causes a human to separate from his/her kaijin form, then Build punches the kaijin inside the tornadoes, thereby defeating the kaijin.
 * Build stops an enemy attack with his left hand and changes it into a diamond shield, then he uses the Muscle Glove to shatter the shield into smaller diamonds that attack the enemy.

Appearances: Ex-Aid Episode 44, True Ending, Build Episode 2, Transformation Course (Kamen Rider Build), Build 3-4, 6 {{-}} {{!}}-{{!}} Soujiki=  GorillaSoujiki Form {{Quote|Gorilla! Soujiki! Are you Ready?|GorillaSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height: 189.0 cm
 * Rider Weight: 111.7 kg
 * Punching Power: 20.7 tons (right arm)/5.7 tons (left arm)
 * Kicking Power: 9.6 tons (right leg)/13.2 tons (left leg)
 * Maximum Jump Height: 26.5 m
 * Maximum Running Speed: 100 m. per 6.2 sec.

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode 3 {{-}} {{!}}-{{!}} Rocket=  GorillaRocket Form {{Quote|Gorilla! Rocket! Are you Ready?|GorillaRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 Gatling Fullbottles, themed after a gorilla and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:
 * Metal Branding:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode 8 {{-}} {{!}}-{{!}} Tank=  GorillaTank Form {{Quote|Gorilla! Tank! Are you Ready?|GorillaTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|GorillaTank Form|ゴリラタンクフォーム|Gorira Tanku Fōmu}} is Build's brown and blue Trial Form accessed through the Gorilla and Tank Fullbottles, themed after a gorilla and a tank.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:
 * Metal Branding:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Gatling=  GorillaGatling Form {{Quote|Gorilla! Gatling! Are you Ready?|GorillaGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|GorillaGatling Form|ゴリラガトリングフォーム|Gorira Gatoringu Fōmu}} is Build's brown and grey Trial Form accessed through the Gorilla and Gatling Fullbottles, themed after a gorilla and a gatling gun.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:
 * Metal Branding:

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic=  GorillaComic Form {{Quote|Gorilla! Comic! Are you Ready?|GorillaComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|GorillaComic Form|ゴリラコミックフォーム|Gorira Komikku Fōmu}} is Build's brown and yellow Trial Form accessed through the Gorilla and Comic Fullbottles, themed after a gorilla and a comic book.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:
 * Metal Branding:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha=  GorillaShoubousha Form {{Quote|Gorilla! Shoubousha! Are you Ready?|GorillaShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|GorillaShoubousha Form|ゴリラショウボウシャフォーム|Gorira Shōbōsha Fōmu}} is Build's brown and scarlet Trial Form accessed through the Gorilla and Shoubousha Fullbottles, themed after a gorilla and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:
 * Metal Branding:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Taka= In any form that uses the Taka Fullbottle, Build is armed with the {{nihongo|Solstall Wings|ソレスタルウィング|Soresutaru Wingu}} that grant him the ability to fly. {{#tag:tabber| Gatling=  HawkGatling Form

{{Quote|Taka! Gatling! Best Match! Are you Ready? Tenkuu no Abarenbou! HawkGatling! Yeahhh!|HawkGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HawkGatling Form|ホークギャトリングフォーム|Hōku Gatoringu Fōmu}} is Build's orange and gray Best Match form accessed with the Taka and Gatling Fullbottles, hence known as the {{nihongo|Rampage of the Skies|天空の暴れん坊|Tenkū no Abarenbō}}. It is themed after a hawk and a gatling gun.
 * Rider Height: 193.0 cm
 * Rider Weight: 107.0 kg
 * Punching Power: 9.7 tons (right arm)/10.0 tons (left arm)
 * Kicking Power: 13.5 tons (right leg)/14.2 tons (left leg)
 * Maximum Jump Height: 41.7 m
 * Maximum Running Speed: 100 m. per 5.8 sec.

While this Best Match has low stats compared to RabbitTank, this is made up for by the Solstall 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.

As a Best Match, this form has two finishers:
 * Build Driver finisher:
 * {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}.
 * Hawk Gatlinger finisher:
 * {{nihongo|Full Bullet|フルブレット|Furu Buretto}}: Build spins the gun's chamber 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, Heisei Generations FINAL: Build & Ex-Aid with Legend Rider {{-}} {{!}}-{{!}} Tank=  TakaTank Form {{Quote|Taka! Tank! Are you Ready?|TakaTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaTank Form|タカタンクフォーム|Taka Tanku Fōmu}} is Build's orange and blue Trial Form accessed with the Taka and Tank Fullbottles, themed after a hawk and a tank.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Diamond= <div style="{{linear-gradient|left|#ff8000, #00FFFF}}"> TakaDiamond Form {{Quote|Taka! Diamond! Are you Ready?|TakaDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaDiamond Form|タカダイヤモンドフォーム|Taka Daiyamondo Fōmu}} is Build's orange and cyan Trial Form accessed with the Taka and Diamond Fullbottles, themed after a hawk and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic= <div style="{{linear-gradient|left|#ff8000, #FFCC00}}"> TakaComic Form {{Quote|Taka! Comic! Are you Ready?|TakaComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaComic Form|タカコミックフォーム|Taka Komikku Fōmu}} is Build's orange and yellow Trial Form accessed with the Taka and Comic Fullbottles, themed after a hawk and a comic book.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Rocket= <div style="{{linear-gradient|left|#ff8000, lightblue}}"> TakaRocket Form {{Quote|Taka! Rocket! Are you Ready?|TakaRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaRocket Form|タカロケットフォーム|Taka Roketto Fōmu}} is Build's orange and light blue Trial Form accessed with the Taka and Rocket Fullbottles, themed after a hawk and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha= <div style="{{linear-gradient|left|#ff8000, #FF0000}}"> TakaShoubousha Form {{Quote|Taka! Shoubousha! Are you Ready?|TakaShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaShoubousha Form|タカショウボウシャフォーム|Taka Shōbōsha Fōmu}} is Build's orange and scarlet Trial Form accessed with the Taka and Shoubousha Fullbottles, themed after a hawk and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Soujiki= <div style="{{linear-gradient|left|#ff8000, #00ffdd}}"> TakaSoujiki Form {{Quote|Taka! Soujiki! Are you Ready?|TakaSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|TakaSoujiki Form|タカ掃除機フォーム|Taka Sōjiki Fōmu}} is Build's orange and turquoise Trial Form accessed with the Taka and Soujiki Fullbottles, themed after a hawk and a vacuum cleaner.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Ninjya= In any form that uses the Ninjya Fullbottle, Build wields the 4 Koma Ninpoutou. It also grants Build the {{nihongo|Onmitsu Scarf|オンミツスカーフ|Onmitsu Sukāfu}} on the right side of his back. {{#tag:tabber| Comic= <div style="{{linear-gradient|left|#5000A0, #FFCC00}}"><font color="#FAAFBA">NinninComic Form {{Quote|Ninjya! Comic! Best Match! Are you Ready? Shinobi no Entertainer! NinninComic! Yeahhh!|NinninComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 {{nihongo|Stealthy Entertainer|忍びのエンターテイナー|Shinobi no Entāteinā}}. It is themed after a ninja and a comic book.
 * Rider Height: 194.0 cm
 * Rider Weight: 90.5 kg
 * Punching Power: 11.1 t (right arm)/8.8 t (left arm)
 * Kicking Power: 10.1 t (right leg)/22.2 t (left leg)
 * Maximum Jump Height: 45.4 m
 * Maximum Running Speed: 100m. per 4.2 sec

This form grants Build a well-balanced abilities akin of Rabbit Tank. Furthermore, it has increased kicking and punching power with the cost of jumping power and speed. The 4 Koma Ninpoutou was designed for this particular Best Match.

As a Best Match, this form has two finishers:
 * Build Driver finisher:
 * {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}
 * 4 Koma Ninpoutou finishers:
 * Build performs four different finishers, depending on how many times the trigger is pulled; the panels light up in ascending order.
 * {{nihongo|Clone Jutsu|分身の術|Bunshin no Jutsu|Art of Cloning}}: Build creates a number of clones of himself.
 * {{nihongo|Fire Jutsu|火遁の術|Katon no Jutsu|Art of Fire Releasing}}: Build delivers a flaming slash attack. While performing this attack, the 4 Koma Ninpoutou announces {{nihongo|Blazing Slash|火炎斬り|Kaen Giri}}.
 * {{nihongo|Wind Jutsu|風遁の術|Fūton no Jutsu|Art of Wind Releasing}}: Build creates a tornado and spins. While performing this attack, the 4 Koma Ninpoutou announces {{nihongo|Tornado Slash|竜巻斬り|Tatsumaki Giri}}.
 * {{nihongo|Stealth Jutsu|隠れ身の術|Kakuremi no Jutsu|Art of Camouflage}}: Build becomes invisible. While performing this attack, the 4 Koma Ninpoutou announces {{nihongo|Doron|ドロン|Doron|lit. "Abscond"}}.

Appearances: Build Episodes 5-7 {{-}} {{!}}-{{!}} Tank= <div style="{{linear-gradient|left|#5000A0, #000080}}"><font color="#FAAFBA">NinjyaTank Form {{Quote|Ninjya! Tank! Are you Ready?|NinjyaTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaTank Form|ニンジャタンクフォーム|Ninjya Tanku Fōmu}} is Build's purple and blue Trial Form accessed through the Ninjya and Tank Fullbottles, themed after a ninja and a tank.
 * Rider Height: 194.0 cm
 * Rider Weight: 101.1 kg
 * Punching Power: 8.9 t (right arm)/13.6 t (left arm)
 * Kicking Power: 19.0 t (right leg)/17.8 t (left leg)
 * Maximum Jump Height: 32.3 m
 * Maximum Running Speed: 100m. per 2.3 sec

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode 6 {{-}} {{!}}-{{!}} Diamond= <div style="{{linear-gradient|left|#5000A0, #00FFFF}}"><font color="#FAAFBA">NinjyaDiamond Form {{Quote|Ninjya! Diamond! Are you Ready?|NinjyaDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaDiamond Form|ニンジャダイヤモンドフォーム|Ninjya Daiyamondo Fōmu}} is Build's purple and cyan Trial Form accessed through the Ninjya and Diamond Fullbottles, themed after a ninja and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Gatling= <div style="{{linear-gradient|left|#5000A0, #808080}}"><font color="#FAAFBA">NinjyaGatling Form {{Quote|Ninjya! Gatling! Are you Ready?|NinjyaGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaGatling Form|ニンジャガトリングフォーム|Ninjya Gatoringu Fōmu}} is Build's purple and gray Trial Form accessed through the Ninjya and Gatling Fullbottles, themed after a ninja and a gatling gun.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Rocket= <div style="{{linear-gradient|left|#5000A0, lightblue}}"><font color="#FAAFBA">NinjyaRocket Form {{Quote|Ninjya! Rocket! Are you Ready?|NinjyaRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaRocket Form|ニンジャロケットフォーム|Ninjya Roketto Fōmu}} is Build's purple and light blue Trial Form accessed through the Ninjya and Rocket Fullbottles, themed after a ninja and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha= <div style="{{linear-gradient|left|#5000A0, #FF0000}}"><font color="#FAAFBA">NinjyaShoubousha Form {{Quote|Ninjya! Shoubousha! Are you Ready?|NinjyaShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaShoubousha Form|ニンジャショウボウシャフォーム|Ninjya Shōbōsha Fōmu}} is Build's purple and scarlet Trial Form accessed through the Ninjya and Shoubousha Fullbottles, themed after a ninja and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Soujiki= <div style="{{linear-gradient|left|#5000A0, #00ffdd}}"><font color="#FAAFBA">NinjyaSoujiki Form {{Quote|Ninjya! Soujiki! Are you Ready?|TakaSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|NinjyaSoujiki Form|ニンジャ掃除機フォーム|Ninjya Sōjiki Fōmu}} is Build's purple and turquoise Trial Form accessed with the Ninjya and Soujiki Fullbottles, themed after a ninja and a vacuum cleaner.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Panda= In any form that uses the Panda Fullbottle, Build is armed with the {{nihongo|Giant Scratcher|ジャイアントスクラッチャー|Jaianto Sukuracchā}} on his right arm.{{#tag:tabber| Rocket= <div style="{{linear-gradient|left|aliceblue, lightblue}}"> RocketPanda Form {{Quote|Panda! Rocket! Best Match! Are you Ready? Buttobi Monotone! RocketPanda! Yeahhh!|RocketPanda's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|RocketPanda Form|ロケットパンダフォーム|Roketto Panda Fōmu}} is Build's white and light blue Best Match form accessed with the Rocket and Panda Fullbottles, hence known as the {{nihongo|Flying Monotone|ぶっ飛びモノトーン|Buttobi Monotōn}}. It is themed after a panda and a rocket.
 * Rider Height: 189.0 cm
 * Rider Weight: 114.0 kg
 * 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: 100m. per 8.5 sec

In this Best Match form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a Best Match, this form's finisher is the {{nihongo|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 BLD Rocket Glove 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 {{-}} {{!}}-{{!}} Gatling= <div style="{{linear-gradient|left|aliceblue, #808080}}"> PandaGatling Form {{Quote|Panda! Gatling! Are you Ready?|PandaGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaGatling Form|パンダガトリングフォーム|Panda Gatoringu Fōmu}} is Build's white and gray Trial Form accessed through the Panda and Gatling Fullbottles, themed after a panda bear and a gatling gun.
 * Rider Height: 189.0 cm
 * Rider Weight: 112.0 kg
 * Punching Power: 15.0 t (right arm)/8.0 t (left arm)
 * Kicking Power: 10.8 t (right leg)/12.3 t (left leg)
 * Maximum Jump Height: 26.6 m
 * Maximum Running Speed: 100m. per 8.6 sec

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode 7 {{-}} {{!}}-{{!}} Tank= <div style="{{linear-gradient|left|aliceblue, #000080}}"> PandaTank Form {{Quote|Panda! Tank! Are you Ready?|PandaTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaTank Form|パンダタンクフォーム|Panda Tanku Fōmu}} is Build's white and blue Trial Form accessed through the Panda and Tank Fullbottles, themed after a panda bear and a tank.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Diamond= <div style="{{linear-gradient|left|aliceblue, #00FFFF}}"> PandaDiamond Form {{Quote|Panda! Diamond! Are you Ready?|PandaDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaDiamond Form|パンダダイヤモンドフォーム|Panda Daiyamondo Fōmu}} is Build's white and cyan Trial Form accessed through the Panda and Diamond Fullbottles, themed after a panda bear and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic= <div style="{{linear-gradient|left|aliceblue, #FFCC00}}"> PandaComic Form {{Quote|Panda! Comic! Are you Ready?|PandaComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaComic Form|パンダコミックフォーム|Panda Komikku Fōmu}} is Build's white and yellow Trial Form accessed with the Panda and Comic Fullbottles, themed after a panda bear and a comic book.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha= <div style="{{linear-gradient|left|aliceblue, #FF0000}}"> PandaShoubousha Form {{Quote|Panda! Shoubousha! Are you Ready?|PandaShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaShoubousha Form|パンダショウボウシャフォーム|Panda Shōbōsha Fōmu}} is Build's white and scarlet Trial Form accessed through the Panda and Shoubousha Fullbottles, themed after a panda and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Soujiki= <div style="{{linear-gradient|left|aliceblue, #00ffdd}}"> PandaSoujiki Form {{Quote|Panda! Soujiki! Are you Ready?|PandaSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PandaSoujiki Form|パンダ掃除機フォーム|Panda Sōjiki Fōmu}} is Build's white and turquoise Trial Form accessed with the Panda and Soujiki Fullbottles, themed after a panda bear and a vacuum cleaner.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Harinezumi= In any form that uses the Harinezumi Fullbottle, Build is armed with the {{nihongo|Spine Knuckle|スパインナックル|Supain Nakkuru}} on his right arm, allowing him to clobber foes with spikes that extend outwards when used. {{#tag:tabber| Shoubousha= <div style="{{linear-gradient|left|white, #FF0000}}"><font color="#BCC6CC">FireHedgehog Form {{Quote|Harinezumi! Shobousha! Best Match! Are you Ready? Rescue Kenzan! FireHedgehog! Yeahhh!|FireHedgehog's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 Shoubousha Fullbottles, hence known as the {{nihongo|Rescue {{W|Kenzan}}|レスキュー剣山|Resukyū Kenzan}}. It is themed after a hedgehog and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

Appearances: Build Episode 8 {{-}} {{!}}-{{!}} Tank= <div style="{{linear-gradient|left|white, #000080}}"><font color="#BCC6CC">HarinezumiTank Form {{Quote|Harinezumi! Tank! Are you Ready?|HarinezumiTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height: 194.0 cm
 * Rider Weight: 102.7 kg
 * Punching Power: 11.0 tons (right arm)/13.6 tons (left arm)
 * Kicking Power: 19.0 tons (right leg)/11.2 tons (left leg)
 * Maximum Jump Height: 28.4 m
 * Maximum Running Speed: 100 m. per 7.0 sec.

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episodes 1-2 {{-}} {{!}}-{{!}} Diamond= <div style="{{linear-gradient|left|white, #00FFFF}}"><font color="#BCC6CC">HarinezumiDiamond Form {{Quote|Harinezumi! Diamond! Are you Ready?|HarinezumiDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HarinezumiDiamond Form|ハリネズミダイヤモンドフォーム|Harinezumi Daiyamondo Fōmu}} is Build's white and cyan Trial Form accessed with the Harinezumi and Diamond Fullbottles, themed after a hedgehog and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Gatling= <div style="{{linear-gradient|left|white, gray}}"><font color="#BCC6CC">HarinezumiGatling Form {{Quote|Harinezumi! Gatling! Are you Ready?|HarinezumiGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HarinezumiGatling Form|ハリネズミガトリングフォーム|Harinezumi Gatoringu Fōmu}} is Build's white and grey Trial Form accessed with the Harinezumi and Gatling Fullbottles, themed after a hedgehog and a gatling gun.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic= <div style="{{linear-gradient|left|white, #FFCC00}}"><font color="#BCC6CC">HarinezumiComic Form {{Quote|Harinezumi! Comic! Are you Ready?|HarinezumiComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HarinezumiComic Form|ハリネズミコミックフォーム|Harinezumi Komikku Fōmu}} is Build's white and yellow Trial Form accessed with the Harinezumi and Comic Fullbottles, themed after a hedgehog and a comic book.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Rocket= <div style="{{linear-gradient|left|white, lightblue}}"><font color="#BCC6CC">HarinezumiRocket Form {{Quote|Harinezumi! Rocket! Are you Ready?|HarinezumiRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HarinezumiRocket Form|ハリネズミロケットフォーム|Harinezumi Roketto Fōmu}} is Build's white and light blue Trial Form accessed through the Harinezumi and Rocket Fullbottles, themed after a hedgehog and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Soujiki= <div style="{{linear-gradient|left|white, #00ffdd}}"><font color="#BCC6CC">HarinezumiSoujiki Form {{Quote|Harinezumi! Soujiki! Are you Ready?|HarinezumiSoujiki's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|HarinezumiSoujiki Form|ハリネズミ掃除機フォーム|Harinezumi Sōjiki Fōmu}} is Build's white and turquoise Trial Form accessed with the Harinezumi and Soujiki Fullbottles, themed after a hedgehog and a vacuum cleaner.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Lion= {{#tag:tabber| Soujiki= <div style="{{linear-gradient|left|#EECC44, #00ffdd}}"><font color="#43C6DB">LionCleaner Form {{Quote|Lion! Soujiki! Best Match! Are you Ready? Tategami Cyclone! LionCleaner! Yeah!|LionCleaner's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 {{Nihongo|Mane Cyclone|鬣サイクロン|Tategami Saikuron}}. It is themed after a lion and a vacuum cleaner.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Best Match form, Build is armed with the {{nihongo|Long Range Cleaner|ロングレンジクリーナー|Rongu Renji Kurīnā}} on his left arm and the {{nihongo|Trash Converter|トラッシュコンバーター|Torasshu Konbātā}} on his left shoulder.

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

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Tank= <div style="{{linear-gradient|left|#EECC44, #000080}}"><font color="#43C6DB">LionTank Form {{Quote|Lion! Tank! Are you Ready?|LionTank's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|LionTank Form|ライオンタンクフォーム|Raion Tanku Fōmu}} is Build's marigold and blue Trial Form accessed with the Lion and Tank Fullbottles, themed after a lion and a tank.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Diamond= <div style="{{linear-gradient|left|#EECC44, #00FFFF}}"><font color="#43C6DB">LionDiamond Form {{Quote|Lion! Diamond! Are you Ready?|LionDiamond's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|LionDiamond Form|ライオンダイヤモンドフォーム|Raion Daiyamondo Fōmu}} is Build's marigold and cyan Trial Form accessed with the Lion and Diamond Fullbottles, themed after a lion and a diamond.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Gatling= <div style="{{linear-gradient|left|#EECC44, gray}}"><font color="#43C6DB">LionGatling Form {{Quote|Lion! Gatling! Are you Ready?|LionGatling's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|LionGatling Form|ライオンガトリングフォーム|Raion Gatoringu Fōmu}} is Build's marigold and gray Trial Form accessed with the Lion and Gatling Fullbottles, themed after a lion and a gatling gun.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Comic= <div style="{{linear-gradient|left|#EECC44, #FFCC00}}"><font color="#43C6DB">LionComic Form {{Quote|Lion! Comic! Are you Ready?|LionComic's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
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As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Rocket= <div style="{{linear-gradient|left|#EECC44, lightblue}}"><font color="#43C6DB">LionRocket Form {{Quote|Lion! Rocket! Are you Ready?|LionRocket's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|LionRocket Form|ライオンロケットフォーム|Raion Roketto Fōmu}} is Build's marigold and light blue Trial Form accessed with the Lion and Rocket Fullbottles, themed after a lion and a rocket.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

In this Trial Form, Build is armed with the {{nihongo|BLD Rocket Glove|BLDロケットグローブ|BLD Roketto Gurōbu}} on his left arm.

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Shoubousha= <div style="{{linear-gradient|left|#EECC44, #FF0000}}"><font color="#43C6DB">LionShoubousha Form {{Quote|Lion! Shoubousha! Are you Ready?|LionShoubousha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|LionShoubousha Form|ライオンショウボウシャフォーム|Raion Shōbōsha Fōmu}} is Build's marigold and scarlet Trial Form accessed with the Lion and Shoubousha Fullbottles, themed after a lion and a fire engine.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

As a mismatched form, this form's finisher is the {{nihongo|Vortex Attack|ボルテックアタック|Borutekku Atakku}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Kaizoku= {{#tag:tabber| Densha= <div style="{{linear-gradient|left|teal, #AAFF88}}"> KaizokuRessha Form {{Quote|Kaizoku! Densha! Best Match! Are you Ready? Keikoku no Hangyakusha! KaizokuRessha! Yeahhh!|KaizokuRessha's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|KaizokuRessha Form|海賊レッシャフォーム|Kaizoku Ressha Fōmu|lit. PirateTrain Form}} is Build's azure and green Best Match form accessed with the Kaizoku and Densha Fullbottles, hence known as the {{nihongo|Valley Rebel|渓谷の反逆者|Keikoku no Hangyakusha}}. It is themed after a pirate and a train.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
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In this Best Match form, Build is armed with the Kaizoku Hassha.

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

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Dragon= {{#tag:tabber| Lock= <div style="{{linear-gradient|left|#0077DD, #CFB53B}}"> KeyDragon Form {{Quote|Dragon! Lock! Best Match! Are you Ready? Fūin no Fantasy Star! KeyDragon! Yeahhh!|KeyDragon's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|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 Lock and Dragon Fullbottles, hence known as the {{nihongo|Seal of Fantasy|封印のファンタジースター|Fūin no Fantajīsutā|lit. Seal of Fantasista}}. It is themed after a lock and a dragon.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Octopus= {{#tag:tabber| Light= <div style="{{linear-gradient|left|#770022, #EEFFCC}}"><font color="#FAAFBA">OctopusLight Form {{Quote|Octopus! Light! Best Match! Are you Ready? Inazuma Technician! OctopusLight! Yeahhh!|OctopusLight's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|OctopusLight Form|オクトパスライトフォーム|Okutopasu Raito Fōmu}} is Build's crimson and pale gold Best Match form accessed with the Octopus and Light Fullbottles, hence known as the {{nihongo|Lightning Technician|稲妻テクニシャン|Inazuma Tekunishan}}. It is themed after an octopus and light.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
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As a Best Match, this form's finisher is the {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} {{!}}-{{!}} Phoenix= {{#tag:tabber| Robot= <div style="{{linear-gradient|left|red, silver}}"> PhoenixRobo Form {{Quote|Phoenix! Robot! Best Match! Are you Ready? Fujimi no Heishi! PhoenixRobo! Yeahhh!|PhoenixRobo's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|PhoenixRobo Form|フェニックスロボフォーム|Fenikkusu Robo Fōmu}} is Build's red and silver Best Match form accessed with the Phoenix and Robot Fullbottles, hence known as the {{nihongo|Immortal Soldier|不死身の兵士|Fujimi no Heishi}}. It is themed after a phoenix and a robot.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
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As a Best Match, this form's finisher is the {{nihongo|Vortex Finish|ボルテックフィニッシュ|Borutekku Finisshu}}.

Appearances: Build Episode TBA {{-}} }}

{{-}} }}

{{-}} {{!}}-{{!}}

Super= {{#tag:tabber| RabbitTank Sparkling= <div style="{{linear-gradient|left|#B22222, #000080}}"> RabbitTank Sparkling Form Rider Statistics Ability Perimeters: {{nihongo|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 Rabbit Tank Sparkling Fullbottle.
 * Rider Height:
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Appearances: Build Episode TBA {{-}} {{!}}-{{!}} Hazard= {{#tag:tabber| RabbitTank Hazard= RabbitTank  Hazard Form Rider Statistics Ability Perimeters: {{nihongo|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.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: Build Episode TBA

{{-}} }} {{-}} }} {{-}} {{!}}-{{!}}

Special= {{#tag:tabber| Wolf= {{#tag:tabber| Sumaho= <div style="{{linear-gradient|left|grey, navy}}"> SumahoWolf Form {{Quote|Wolf! Sumaho! Best Match! Are you Ready? Tsunagaru Ippiki Ookami! SumahoWolf! Yeahhh!|SumahoWolf's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|SumahoWolf Form|スマホウルフフォーム|Sumaho Urufu Fōmu}} is Build's grey and blue Best Match form accessed with the Wolf and Sumaho Fullbottles, hence known as the {{nihongo|Connected Lone Wolf|繋がる一匹狼|Tsunagaru Ippiki Ōkami}}. It is themed after a wolf and a smartphone.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

This form is exclusive to an upcoming YouTube series. {{-}} }}

{{-}} {{!}}-{{!}} Scorpion= {{#tag:tabber| Gold= <div style="{{linear-gradient|left|#960018, #CFB53B}}"> GoldScorpion Form {{Quote|Scorpion! Gold! Best Match! Are you Ready? Kouki naru Dokubari! GoldScorpion! Yeahhh!|GoldScorpion's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|GoldScorpion Form|ゴールドスコーピオンフォーム|Gōrudo Sukōpion Fōmu}} is Build's marigold and maroon Best Match form accessed with the Scorpion and Gold Fullbottles, hence known as the {{nihongo|Golden Stinger|高貴なる毒針|Kōki naru Dokubari}}. It is themed after a scorpion and gold.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

This form is exclusive to an upcoming YouTube series. {{-}} }}

{{-}} {{!}}-{{!}} Tora= {{#tag:tabber| UFO= <div style="{{linear-gradient|left|#EECC44, violet}}"> ToraUFO Form {{Quote|Tora! UFO! Best Match! Are you Ready? Mikakunin Jungle Hunter! ToraUFO! Yeahhh!|ToraUFO's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|ToraUFO Form|トラユーフォーフォーム|Tora Yūfō Fōmu}} is Build's dark yellow and violet Best Match form accessed with the Tora and UFO Fullbottles, hence known as the {{nihongo|Unidentified Jungle Hunter|未確認ジャングルハンター|Mikakunin Janguru Hantā}}. It is themed after a tiger and an UFO.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

This form is exclusive to an upcoming YouTube series. {{-}} }}

{{-}} {{!}}-{{!}} Kujira= {{#tag:tabber| Jet= <div style="{{linear-gradient|left|navy, lightblue}}"> KujiraJet Form {{Quote|Kujira! Jet! Best Match! Are you Ready? Amakakeru Big Wave! KujiraJet! Yeahhh!|KujiraJet's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|KujiraJet Form|クジラジェットフォーム|Kujira Jetto Fōmu|}} is Build's blue and light blue Best Match form accessed with the Kujira and Jet Fullbottles, hence known as the {{nihongo|Soaring Big Wave|天翔けるビッグウェーブ|Amakakeru Biggu U~ēbu}}. It is themed after a whale and a jet plane.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

This form is exclusive to an upcoming YouTube series. {{-}} }}

{{-}} {{!}}-{{!}} Kirin= {{#tag:tabber| Senpuki= <div style="{{linear-gradient|left|orange, lightblue}}"> KirinCyclone Form {{Quote|Kirin! Senpuki! Best Match! Are you Ready? Arashi wo Yobu Kyotou! KirinCyclone! Yeahhh!|KirinCyclone's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: {{nihongo|KirinCyclone Form|キリンサイクロンフォーム|Kirin Saikuron Fōmu}} is Build's light orange and baby blue Best Match form accessed with the Kirin and Senpuki Fullbottles, hence known as the {{nihongo|Storm-calling Huge Tower|嵐を叫ぶ巨塔|Arashi wo Yobu Kyotou}}. It is themed after a giraffe and an electric fan.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

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

This form is exclusive to an upcoming YouTube series. {{-}} }} {{-}} {{!}}-{{!}} SumahoWolf Hazard= SumahoWolf  Hazard Form Rider Statistics Ability Perimeters: {{nihongo|SumahoWolf 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 SumahoWolf Form with the Hazard Trigger.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

This form is exclusive to an upcoming YouTube series. {{-}} }}

{{-}} <!--{{!}}-{{!}} Legend Rider= {{#tag:tabber| 1 Rider= {{#tag:tabber| Den-O= <div style="{{linear-gradient|left|#red, #AAFF88}}"> Den-O Form {{Quote|Momotaros! Densha! Best Match! Are you Ready? Den-O! Yeahhh!!!!|Den-O Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Den-O.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}}

Decade= <div style="{{linear-gradient|left|#DFDFDF, #FF00FF}}"><font color="#00FF00">Ex-Aid Form {{Quote|Doctor! Game! Best Match! Are you Ready? Ex-Aid! Mighty Jump! Mighty Kick! Mighty Mighty Action X!|Ex-Aid Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Decade.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
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Appearances: TBA {{-}} {{!}}-{{!}}

W= <div style="{{linear-gradient|left|#2DB300, #000000}}"> W Form {{Quote|Tantei! USB Memory! Best Match! Are you Ready? W! (CycloneJoker transformation music)|W Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider W.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}} OOO= <div style="{{linear-gradient|left|#ff8000, #08ff00}}"> OOO Form {{Quote|Taka! Medal! Best Match! Are you Ready? OOO! (Tatoba Combo transformation music)|OOO Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider OOO.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}}

{{!}}-{{!}} Fourze= <div style="{{linear-gradient|left|white, lightblue}}"> Fourze Form {{Quote|Yuujou! Rocket! Best Match! Are you Ready? Fourze! Yeahhh!|Fourze Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Fourze.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}}

{{!}}-{{!}} Wizard= <div style="{{linear-gradient|left|#000000, #00FFFF}}"> OOO Form {{Quote|Mahoutsukai! Diamond! Best Match! Are you Ready? Wizard! Please! Hi-Hi, Hi-Hi-Hi! Yeahhh!"|Wizard Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Wizard.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}}

Gaim= <div style="{{linear-gradient|left|orange, #CFB53B}}"> Gaim Form {{Quote|Orange! Lock! Best Match! Are you Ready? Gaim! Orange Arms: Hanamichi on Stage! Yeahhh!|Gaim Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Gaim.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}}

Drive= <div style="{{linear-gradient|left|red}}"> Drive Form {{Quote|Keisatsukan! F1! Best Match! Are you Ready? Drive! (Drive Type: Speed Transformation Music) Yeahhh!|Drive Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Drive.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}}

Ghost= <div style="{{linear-gradient|left|black}}"> Ghost {{Quote|Obake! Parka! Best Match! Are you Ready? Ghost! Let's Go! Kakugo! Gho-Gho-Gho-Ghost! GO! GO! GO! GO! Yeahhh!|Ghost Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Ghost.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}}

Ex-Aid= <div style="{{linear-gradient|left|#DFDFDF, #FF00FF}}"><font color="#000000">Ex-Aid Form {{Quote|Doctor! Game! Best Match! Are you Ready? Ex-Aid! Mighty Jump! Mighty Kick! Mighty Mighty Action X!|Ex-Aid Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Ex-Aid.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} }} {{-}} {{!}}-{{!}} Hybrid Rider= {{#tag:tabber| FourzeWizard= {{

FourzeWizard= <div style="{{linear-gradient|left|white, black}}"> ForuzeWizard Form {{Quote|Fourze! Wizard! Best Match! Are you Ready? Maho no Uchu Ryoko! FourzeWizard! Yeahhh!|FourzeWizard Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Fourze and Kamen Rider Wizard.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA

{{-}} {{!}}-{{!}} GaimDrive= <div style="{{linear-gradient|left|#ff8000, red}}"> GaimDrive Form {{Quote|Gaim! Drive! Best Match! Are you Ready? Are you Ready? Kajitsu no Top Gear! GaimDrive! Yeahhh!|GaimDrive Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Gaim and Kamen Rider Drive.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA

{{-}} {{!}}-{{!}} GhostEx-Aid= <div style="{{linear-gradient|left|#black, magenta}}"><font color="#ff8000">GhostEx-Aid Form {{Quote|Ghost! Ex-Aid! Best Match! Are you Ready? Are you Ready? Batchi Level Up! GhostEx-Aid! Yeahhh!|GhostEx-Aid Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Ghost and Kamen Rider Ex-Aid.
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Appearances: TBA {{-}} {{!}}-{{!}} }} Miscellaneos= {{#tag:tabber| ButtobaGanba= <div style="{{linear-gradient|left|#4889e0, #d3ba7e}}"><font color="#red">ButtobaGanba Form {{Quote|Buttobasoul! Ganbarizing! Best Match! Are you Ready? Kikaijikake no Touginjou! ButtobaGanba! Yeahhh!|ButtobaGanba Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Kamen Rider Buttobasoul and Kamen Rider Battle: Ganbarizing. }} Appearances: TBA {{-}} {{!}}-{{!}}
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Super Hero Time= <div style="{{linear-gradient|left|#0047ab, #29ab87}}"><font color="#d2b48c">Super Hero Time Form {{Quote|Kamen Rider! Super Sentai! Best Match! Are you Ready? Nichiasa Saikou! Super Hero Time! Yeahhh!|Super Hero Time Best Match's transformation announcement|Kamen Rider Build}} Rider Statistics Ability Perimeters: This form is an upcoming Legend Rider form themed after Super Hero Time. }} Appearances: TBA {{-}} {{!}}-{{!}} --> {{-}} }}
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Devices

 * Build Driver - Transformation device.
 * Fullbottles - Transformation trinkets.
 * Build Phone - Build's personal smartphone that can transform into the Machine Builder.
 * Hazard Trigger - Build's power up device that lets him achieve his upgraded Hazard forms by integrating it into the Build Driver.

Weapons

 * Drill Crusher - Build's personal drill-like weapon.
 * Muscle Glove - Build's gorilla gauntlet in conjunction with any form that uses the Gorilla Fullbottle.
 * Solstall Wings - Build's hawk-like wings in conjunction with any form that uses the Taka Fullbottle.
 * Hawk Gatlinger - Build's rifle-like weapon in conjunction with any form that uses the Gatling Fullbottle.
 * 4 Koma Ninpoutou - Build's katana-like weapon in conjunction with any form that uses the Ninjya Fullbottle.
 * Giant Scratcher - Build's claw-like weapon in conjunction with any form that uses the Panda Fullbottle.
 * BLD Rocket Glove - Build's rocket-like weapon in conjunction with any form that uses the Rocket Fullbottle.
 * Spine Knuckle - Build's spiked gauntlet in conjunction with any form that uses the Harinezumi Fullbottle.
 * Long Range Cleaner and Trash Converter - Build's vacuum cleaner-like weapons in conjunction with any form that uses the Soujiki Fullbottle.
 * Kaizoku Hassha - Build KaizokuRessha Form's personal weapon.

Vehicles

 * Machine Builder - Build's personal Rider Machine that is transformed from the Build Phone.

Rider Gashat
Kamen Rider Build (仮面ライダービルドガシャット): Would presumably allow Kamen Rider Ex-Aid to transform into Build Gamer.

Relationships

 * Nascita coffee
 * Soichi Isurugi: Sento was taken in by Soichi during their first encounter, as Soichi believed that Sento had the potential to become Build. Both are on good terms like best friends. Though Sento's suspicions rose when he discovered that Soichi may be connected to Faust, he forgave him after Soichi explained the truth.
 * Misora Isurugi: Sento always uses her for fertilizing Fullbottles, likely being introduced to her ability by Soichi when he suggested Sento become Kamen Rider Build. Although they usually bicker and prank each other, Sento cares about her greatly.
 * Ryuga Banjyou: Ryuga is titled as Sento's "best match" by Sento for helping him search for his memory and Night Rogue, as he's the only surviving experiment who retained his memory and escaped before entirely becoming a Smash. They are shown to constantly banter.
 * Sawa Takigawa: Sawa was saved by Build before he unknowingly revealed his identity and led her to his base. In exchange for her silence, she asks that Sento gives her an interview on the Kamen Rider. Sento agreed on the condition she not only kept his identity secret, but also aid him in solving the mystery of the Smash and his missing memories. Eventually, Sento finds Sawa a bit annoying, as she comments wildly when he is trying to battle.


 * Past Riders:
 * Emu Hojo: It's unknown why Sento planned to attack Emu and take his essence.


 * Others:
 * Tatsuya Kishida: Before Sento's disappearance, he was childhood friends with Tatsuya and were bandmates. They were so close that they called each other "bros." After Sento became Build and reunited with Tatsuya, he had no memory of him but continued to protect him as his duties of Build.

Portrayal
Sento Kiryu is portrayed by Atsuhiro Inukai (犬飼 貴丈). As Kamen Rider Build, his suit actor is Seiji Takaiwa (高岩 成ニ) and Yuya Nawata (縄田 雄哉) in his televised debut in the 44th episode of Kamen Rider Ex-Aid.

Rider No.
As the leading rider protagonist of Kamen Rider Build, Build is labelled Kamen Rider #34 (仮面ライダー34号) and Heisei Rider #19 (平成ライダー19号).

Etymology
The kanji used to spell his first name, Sento (戦兎), is composed of the first kanji for tank (戦車) and the kanji for rabbit (兎),this is referring to Build's primary form,RabbitTank.

His real name, Taro Satou (佐藤 太郎),is likely referring the names two subjects about RabbitTank in real life. Taro is derived from the EH500 Kintaro Tank Freight Train and Satou is derived from a Japanese picture book, Sato the Rabbit (うさぎのさとうくん).