Kaisers

This article is about a group of villains in Kamen Rider Build.

For the Kamen Rider duo in Kamen Rider Kabuto, see Hell Brothers.

Kaisers (カイザー, Kaizā) is the name of several villains in Kamen Rider Build, including the following characters:

Fu Washio
(Remocon Bro's, Hell Bro's)

Rai Washio
(Engine Bro's)

Nariaki Utsumi
(Hell Bro's; test user only)

Kaisei Mogami (World of Build)
(Kaiser, Bikaiser)

Kaisei Mogami (World of Ex-Aid)
(Kaiser Reverse, Bikaiser)

Unidentified man
(Nebula Hell Bro's)

Clone Hell Bro's
(Hell Bro's)

Yoshikazu Takahashi
(Remocon Bro's)

Norio Matsui
(Engine Bro's)

Engine Bro's (imitation)
(Engine Bro's)

Remocon Bro's (imitation)
(Remocon Bro's)

Remocon Bro's (imitation)
(Hell Bro's)

History

Origin

The Kaiser System was originally developed by Kaisei Mogami of the World of Build in conjunction with his other self from the World of Ex-Aid as a biological weapon via the combination of Nebula Gas and Bugster Virus. Joining forces, they became the Bikaiser, only to be defeated by the combined forces of Kamen Rider Build and Kamen Rider Ex-Aid. ^{[Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders]}

Hell Bro's

Acting on behalf of Blood Stalk and Nanba Heavy Industries, Nariaki Utsumi updated the Kaiser System. Its test subject was a man who was abducted and exposed to Nebula Gas. However, instead of becoming a Smash, he was provided with a Nebulasteam Gun to become the prototype Nebula Hell Bros. Accompanied by a squad of Faust Guardians, Nebula Hell Bros was sent to attack a Touto facility holding Fullbottles. He was confronted by Sento Kiryu who, recognizing the model as a Bikaiser, ^{[First Chapter]} initially believed him to be Kaisei Mogami, the man who originally developed and used the Kaiser System to transform.

After scrapping the Guardians in ToraUFO Form, Kamen Rider Build assumed KirinCyclone to engage the Bikaiser before switching to KujiraJet to defeat him. With the Kaiser transformation canceled, Sento found the subject to be a mere amnesiac whom he took to safety. Meanwhile, Nariaki Utsumi, having used the battle to finalize the new Bikaiser he created, recovered the Nebulasteam Gun left behind by the Nebula Hell Bros which, upon inserting the Remocon and Engine Gears, transformed him into the complete Bikaiser Hell Bros. ^{[Next Chapter]}

Holographic constructs of Engine Bros and Remocon Bros were pitted against Gentoku Himuro when he first transformed into Kamen Rider Rogue. Fueled by rage, Rogue easily defeated them. ^{[Prologue: NIGHT ROGUE RISES]}

A Clone Hell Bro's was created by Nariaki Utsumi and pitted against various Kamen Rider holograms, including Build RabbitTank Sparkling, Cross-Z Charge and Build Hazard. Being a clone itself, Clone Hell Bros lacked human emotions as well as a sense of pain. Ultimately, Utsumi pitted the Clone Hell Bro's against the real Kamen Rider Build, whom he instructed to use the Same and Bike Fullbottles to defeat it. ^{[Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~: Final Chapter]} Data collected from the Clone Hell Bro's were used by Utsumi to create the Clone Smashes. ^{[Surging Magma!]}

Ultimately, the Nebulasteam Gun and Gears were granted to brothers Fu and Rai Washio, whom served as soldiers of Seito, which CEO Juzaburo Namba backed to dominate Japan. These new Hell Bro's Kaisers proved superior in power to the Hard Smash Hazards as well as the Kamen Riders prior to Rogue. ^{[The Phantom of the West]}

Forms

• Standard
• Fusion

• Remocon
• Engine
• Blue
• Red

Remocon Bro's

Remocon Bro's

"Gear Remocon! Funky! (Rhythmic beeping) Remote control gear!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 103.5 kg

Ability Parameters

• Punching Power: 30.5 t
• Kicking Power: 37.2 t
• Maximum Jump Height: 48.6 m
• Maximum Running Speed: 100 m per 1.7 seconds

Remocon Bro's (リモコンブロス, Rimokon Burosu) is the turquoise Kaiser accessed with Gear Remocon.

Remocon Bro's possesses strength to rival Kamen Rider Grease, Kamen Rider Cross-Z Charge, and Kamen Rider Build RabbitTank Sparkling Form, only beginning to struggle with Build's RabbitTank Hazard Form.

Remocon Bros is composed of the following parts:

• Remocon Bro's Head (リモコンブロスヘッド, Rimokon Burosu Heddo): The helmet.
  • Remocon Dark Visor (リモコンダークバイザー, Rimokon Dāku Baizā): The remote-control like visor covering the entire right side of the helmet. It is a shock-resistant frame that has been stretched to demonstrate high defensive capabilities against physical attacks.
  • Grudge Signal (グラッジシグナル, Gurajji Shigunaru): The turquoise gear on the forehead. When the user's level of anger surges, the chest-mounted Nebula Generator is operated at a higher rate, resulting in increased combat ability.
  • Dusk Seeker Eye (ダスクシーカーアイ, Dasuku Shīkā Ai): The red eye. It is a highly sensitive sensor that can detect a moving body's reaction and heat sources. It is also capable of night vision, chemical detection and can examine enemy traces.
  • RB Side Blade (RBサイドブレード, RB Saido Burēdo): The antenna. It can collect information in realtime to grasp the capabilities of enemies. It also manages the body's condition and automatically repairs any broken or damaged areas.
  • RB Face Guard (RBフェイスガード, RB Feisu Gādo): A defensive gear located around the mouth and chin area. It can release a special wave to weaken an enemy's energy attack, minimising damage.
  • Air Face Duct (エアフェイスダクト, Ea Feisu Dakuto): Exhaust devices/air filters located around the chin area. When air is breathed in, harmful substances are removed. It can discharge any taken toxins back into the environment.
• Cog Chest Armor (コグチェストアーマー, Kogu Chesuto Āmā): The robust chest armor. It has a built-in Nebula Generator (ネビュラジェネレーター, Nebyura Jenerētā) which can produce special steam that enhances Remocon Bro's' fighting ability by temporarily speeding up movements to increase attack power.
• Gear Steam Shoulder (ギアスチームショルダー, Gia Suchīmu Shorudā): The left shoulder armor. It optimises arm movement to increase attack efficiency. It can scatter colored gas through armor gaps.
• RB Unlimited Suit (RBアンリミテッドスーツ, RB Anrimiteddo Sūtsu): The shockproof bodysuit. Along with protecting the wearer’s body, there is a limiter installed that can be released to bring out full physical ability.
• Punishment Arms (パニッシュメントアーム, Panisshumento Āmu): The arms. They combine power and speed, and is capable of rapid punches and elbow blows.
• Gear Torque Gauntlet (ギアトルクガントレット, Gia Toruku Gantoretto): A special device mounted on the left forearm. It can generate special energy cutters in the form of gears to launch at enemies.
• Dominate Gloves (ドミネイトグローブ, Domineito Gurōbu): The reinforced hands. It's shape makes it suitable for melee attacks, and is capable of thrusting attacks thanks to its sharp claw-like fingertips.
• Puishment Legs (パニッシュメントレッグ, Panisshumento Reggu): The legs. They combine power and speed, and is capable of continuus kicks and high-knee kicks.
• Metal Knee Bat (メタルニーバット, Metaru Nī Batto): The knee armor. Optimises leg movement to improve their speed.
• Aidron Shoes (アイドロンシューズ, Aidoron Shūzu): The feet. They are good at quick and quiet movements, allowing Remocon Bro's to quickly sneak up to enemies. A special steam can be dispersed from the tips to create afterimages, disorienting opponents.

Remocon Bro's has 3 different finishers:

• Nebulasteam Gun finisher:
  • Funky Drive (ファンキードライブ, Fankī Doraibu): Remocon Bro's channels the power of a Gear and performs a powerful blast attack.
    • Gear Engine:
    • Gear Remocon: Remocon Bro's shoots energy gears at the enemy. This finisher can be accompanied with a Kaiser wielding the Steam Blade.
  • Funky Attack (ファンキーアタック, Fankī Atakku) Remocon Bro's channels the powers of a Fullbottle and performs a powerful blast attack.
• Nebulasteam Rifle finisher:
  • Funky Shot (ファンキーショット, Fankī Shotto): Remocon Bro's channels the power of a Gear or Fullbottle and performs a powerful blast attack.
    • Gear Engine:
      • Elek Steam: Remocon Bro's shoots an electric energy-like engine bolt at the enemy.
    • Gear Remocon:

Appearances: ROGUE Episode 1, Build Episodes 23-25, 29-32

Engine Bro's

Engine Bro's

"Gear Engine! Funky! (Electronic music and engine revving) Engine running gear!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 103.5 kg

Ability Parameters

• Punching Power: 30.5 t
• Kicking Power: 37.2 t
• Maximum Jump Height: 48.6 m
• Maximum Running Speed: 100 m per 1.7 seconds

Engine Bro's (エンジンブロス, Enjin Burosu) is the white Kaiser accessed with Gear Engine.

Engine Bro's possesses strength to rival Kamen Rider Grease, Kamen Rider Cross-Z Charge, and Kamen Rider Build RabbitTank Sparkling Form, only beginning to struggle with Build's RabbitTank Hazard Form. Engine Bro's, however, is not without a weakness. Being based on an engine, he can easily be damaged with water-based attacks.

Engine Bro's is composed of the following parts:

• Engine Bro's Head (エンジンブロスヘッド, Enjin Burosu Heddo): The helmet.
  • Engine Dark Visor (エンジンダークバイザー, Enjin Dāku Baizā): The engine-like visor covering the entire left side of the helmet. It is a shock-resistant frame that has been stretched to demonstrate high defensive capabilities against physical attacks.
  • Grudge Signal (グラッジシグナル, Gurajji Shigunaru): The white gear on the forehead. When the user's level of anger surges, the chest-mounted Nebula Generator is operated at a higher rate, resulting in increased combat ability.
  • Dusk Seeker Eye (ダスクシーカーアイ, Dasuku Shīkā Ai): The red eye. It is a highly sensitive sensor that can detect a moving body's reaction and heat sources. It is also capable of night vision, chemical detection and can examine enemy traces.
  • EB Side Blade (EBサイドブレード, EB Saido Burēdo): The antenna. It can collect information in realtime to grasp the capabilities of enemies. It also manages the body's condition and automatically repairs any broken or damaged areas.
  • EB Face Guard (EBフェイスガード, EB Feisu Gādo): A defensive gear located around the mouth and chin area. It can release a special wave to weaken an enemy's energy attack, minimising damage.
  • Air Face Duct (エアフェイスダクト, Ea Feisu Dakuto): Exhaust devices/air filters located around the chin area. When air is breathed in, harmful substances are removed. It can discharge any taken toxins back into the environment.
• Cog Chest Armor (コグチェストアーマー, Kogu Chesuto Āmā): The robust chest armor. It has a built-in Nebula Generator (ネビュラジェネレーター, Nebyura Jenerētā) which can produce special steam that enhances Remocon Bro's' fighting ability by temporarily speeding up movements to increase attack power.
• Gear Steam Shoulder (ギアスチームショルダー, Gia Suchīmu Shorudā): The right shoulder armor. It optimises arm movement to increase attack efficiency. It can scatter colored gas through armor gaps.
• EB Unlimited Suit (EBアンリミテッドスーツ, EB Anrimiteddo Sūtsu): The shockproof bodysuit. Along with protecting the wearer’s body, there is a limiter installed that can be released to bring out full physical ability.
• Punishment Arms (パニッシュメントアーム, Panisshumento Āmu): The arms. They combine power and speed, and is capable of rapid punches and elbow blows.
• Gear Torque Gauntlet (ギアトルクガントレット, Gia Toruku Gantoretto): A special device mounted on the right forearm. It can generate special energy cutters in the form of gears to launch at enemies.
• Dominate Gloves (ドミネイトグローブ, Domineito Gurōbu): The reinforced hands. It's shape makes it suitable for melee attacks, and is capable of thrusting attacks thanks to its sharp claw-like fingertips.
• Puishment Legs (パニッシュメントレッグ, Panisshumento Reggu): The legs. They combine power and speed, and is capable of continuus kicks and high-knee kicks.
• Metal Knee Bat (メタルニーバット, Metaru Nī Batto): The knee armor. Optimises leg movement to improve their speed.
• Aidron Shoes (アイドロンシューズ, Aidoron Shūzu): The feet. They are good at quick and quiet movements, allowing Engine Bro's to quickly sneak up to enemies. A special steam can be dispersed from the tips to create afterimages, disorienting opponents.

Engine Bro's has 3 different finishers:

• Nebulasteam Gun finisher:
  • Funky Drive (ファンキードライブ, Fankī Doraibu): Engine Bro's channels the power of a Gear and performs a powerful blast attack.
    • Gear Engine:
    • Gear Remocon: Engine Bro's shoots energy gears at the enemy. This finisher can be accompanied with a Kaiser wielding the Steam Blade.
  • Funky Attack (ファンキーアタック, Fankī Atakku) Engine Bro's channels the powers of a Fullbottle and performs a powerful blast attack.
• Nebulasteam Rifle finisher:
  • Funky Shot (ファンキーショット, Fankī Shotto): Engine Bro's channels the power of a Gear or Fullbottle and performs a powerful blast attack.
    • Gear Engine:
    • Gear Remocon:

Appearances: ROGUE Episode 1, Build Episodes 23-26, 29-32

Kaiser

Kaiser

"Gear Remocon! Funky! (Rhythmic beeping) Remote control gear!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 103.5 kg

Ability Parameters

• Punching Power: 20.3 t
• Kicking Power: 24.8 t
• Maximum Jump Height: 32.4 m
• Maximum Running Speed: 100 m per 2.8 seconds

Kaiser (カイザー, Kaizā), also named Left Kaiser (レフトカイザー, Refuto Kaizā), is the blue Kaiser accessed with a blue Gear Remocon.

Kaiser's finisher is the Funky Drive (ファンキードライブ, Fankī Doraibu): Kaiser channels the power of a Gear and performs a powerful blast attack.

• Gear Remocon: Kaiser fires a blue large gear energy shot at the enemy.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 23 (archive footage only)

Kaiser Reverse

Kaiser Reverse

"Gear Engine! Funky! (Electronic music and engine revving) Engine running gear!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 103.5 kg

Ability Parameters

• Punching Power: 20.3 t
• Kicking Power: 24.8 t
• Maximum Jump Height: 32.4 m
• Maximum Running Speed: 100 m per 2.8 seconds

Kaiser Reverse (カイザーリバース, Kaizā Ribāsu), also named Right Kaiser (ライトカイザー, Raito Kaizā), is the red Kaiser accessed with a red Gear Engine.

Kaiser Reverse's finisher is the Funky Drive (ファンキードライブ, Fankī Doraibu): Kaiser Reverse channels the power of a Gear and performs a powerful blast attack.

• Gear Engine: Kaiser Reverse fires a large energy shot at the enemy, then follows it up with a roundhouse kick that leaves behind a trail of red energy.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 23 (archive footage only)

• Nebula Hell Bro's
• Hell Bro's
• Bikaiser

Nebula Hell Bro's

• Bro's
• Kaiser

Nebula Hell Bro's

Nebula Hell Bro's (Bikaiser version)

Statistics

• Height: 202.0 cm
• Weight: 108.0 kg

Ability Parameters (Hell Bro's version)

• Punching Power: 41.6 t
• Kicking Power: 50.6 t
• Maximum Jump Height: 64.8 m
• Maximum Running Speed: 100 m per 1.4 seconds

Nebula Hell Bro's (ネビュラヘルブロス, Nebyura Heru Burosu) is the prototype of Hell Bro's. It also serves as the initial form of the completed Bikaiser/Hell Bro's and is seen briefly during transformation before combining with both component Kaisers' gears.

Unlike the completed Kaisers, the Nebula Hell Bros is similar to a standard Smash transformation in that the user mindlessly attacks anyone in sight. After the transformation is cancelled, the user has no memory of their actions while transformed.

Appearances: Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders, Raising the Hazard Level ~7 Best Matches~ Episodes 1-2, Build Episodes 26-27, 29-32

Hell Bro's

Hell Bro's

"Gear Engine! Gear Remocon! Funky Match! Fever! (Rhythmic beeping and engine revving) Perfect!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 108.0 kg

Ability Parameters

• Punching Power: 41.6 t
• Kicking Power: 50.6 t
• Maximum Jump Height: 64.8 m
• Maximum Running Speed: 100 m per 1.4 seconds

Hell Bro's (ヘルブロス, Heru Burosu) is the fusion of Engine Bro's and Remocon Bro's accessed by inserting either Gear Engine or Gear Remocon into the Nebulasteam Gun, then removing it and inserting the other gear before pulling the trigger.

As Hell Bro's is a fusion of both Kaisers, Hell Bro's stats are higher than even Kamen Rider Rogue, with speed similar to Build's Hazard Forms and average jumping power.

Hell Bro's has 3 different finishers:

• Nebulasteam Gun finisher:
  • Funky Finish (ファンキーフィニッシュ, Fankī Finisshu): Hell Bro's channels the power of a Gear and performs a powerful blast attack.
    • Gear Engine:
    • Gear Remocon:
  • Funky Attack (ファンキーアタック, Fankī Atakku) Hell channels the powers of a Fullbottle and performs a powerful blast attack.
• Nebulasteam Rifle finisher:
  • Funky Shot (ファンキーショット, Fankī Shotto): Hell channels the power of a Gear or Fullbottle and performs a powerful blast attack.
    • Gear Engine:
    • Gear Remocon:

Appearances: Raising the Hazard Level ~7 Best Matches~ Episodes 2-3, Build Episodes 26-27, 29-32

Bikaiser

Bikaiser

"Gear Engine! Gear Remocon! Funky Match! Fever! (Rhythmic beeping and engine revving) Perfect!"

―Transformation announcement^[src]

Statistics

• Height: 202.0 cm
• Weight: 108.0 kg

Ability Parameters

• Punching Power: 40.6 t
• Kicking Power: 49.6 t
• Maximum Jump Height: 64.8 m
• Maximum Running Speed: 100 m per 1.4 seconds

Bikaiser (バイカイザー, Baikaizā) is the fusion of Kaiser and Kaiser Reverse accessed when both Kaisers transform together.

Appearances: Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, Build Episode 27 (archive footage only)

Equipment

Arsenal

• Nebulasteam Gun - Transformation device
• Gears - Transformation trinkets

Behind the Scenes

Conception

In the script of Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders, the Kaisers of Build World and Ex-Aid World were respectively named as L Kaiser (エルカイザー, Eru Kaizā, Left Kaiser) and R Kaiser (アールカイザー, Āru Kaizā, Right Kaiser). Coincidentally, this naming would have echoed the Double Action Gamer of Kamen Rider Ex-Aid.

Notes

• The Kaisers' undersuit is shared with Night Rogue, Blood Stalk, who utilize the Nebulasteam Gun's older model, the Transteam Gun. Kamen Rider MadRogue also shares the same undersuit but with different colors.
• The combination of the two alternate Kaisers into the Bikaiser recalls the Paradox Roidmude of Kamen Rider Drive: Surprise Future.
• The Kaisers' abiotic motifs (Engine and Remocon) have Best Match with the two biotic motifs used by Gentoku Himuro (Bat and Crocodile).

Appearances

• Kamen Rider Build
  • Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders
  • ROGUE
    • Prologue: Night Rogue Rises
  • Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~
    • First Chapter
    • Next Chapter
    • Final Chapter
  • Episode 23: The Phantom of the West
  • Episode 24: A Man Called Rogue
  • Episode 25: The Idol Awakens
  • Episode 26: The Treacherous Deathmatch
  • Episode 27: The Counterattack Hero
  • Episode 29: The Opening Bell Rings
  • Episode 30: The Truth of the Pandora Box