Kaisers

is the name of several villains in Kamen Rider Build, including the following characters:
Fu Washio.png| Fu Washio(Remocon Bro's, Hell Bro's)|link=Fu Washio
Rai Washio.png| Rai Washio(Engine Bro's)|link=Rai Washio
Nariaki Utsumi (Namba).png| Nariaki Utsumi(Hell Bro's; test user only)|link=Nariaki Utsumi
Kaisei Mogami.png| Kaisei Mogami (World of Build)(Kaiser, Bikaiser)|link=Kaisei Mogami
Kaisei Mogami Ex-Aid World.jpg| Kaisei Mogami (World of Ex-Aid)(Kaiser Reverse, Bikaiser)|link=Kaisei Mogami (World of Ex-Aid)
Nebula Hell Bros human.jpg| Unidentified man(Nebula Hell Bro's)|link=Nebula Hell Bro's
Clone Hell Bros.png| Clone Hell Bro's(Hell Bro's)|link=Nebula Hell Bro's
Yoshikazu Takahashi.jpg| Yoshikazu Takahashi(Remocon Bro's)|link=Yoshikazu Takahashi
Norio Matsui.jpg| Norio Matsui(Engine Bro's)|link=Norio Matsui
Evolto Engine Bro's Profile.png| Engine Bro's (imitation)(Engine Bro's)|link=Engine Bro's (imitation)
Evolto Remocon Bro's Profile.png| Remocon Bro's (imitation)(Remocon Bro's)|link=Remocon Bro's (imitation)
Evolto Hell Bro's Profile.png| Remocon Bro's (imitation)(Hell Bro's)|link=Remocon Bro's (imitation)
==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. 
===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, 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. 
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. 
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. Data collected from the Clone Hell Bro's were used by Utsumi to create the Clone Smashes. 
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. 
==Forms==
==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 and . Coincidentally, this naming would have echoed the Double Action Gamer of Kamen Rider Ex-Aid.https://www.daily.co.jp/gossip/2017/12/09/0010803327.shtml
==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==
==Navigation==
ru:Кайзеры
Category:Build Characters
Category:Villains
Category:Debatable Riders
Category:Build Riders
Category:Heisei Era Riders
Category:Heisei Phase 2 Riders
Category:Riders with more than one identity