Rai Washio

Rai Washio is the younger brother of Fu Washio, hailing from Seito. He is able to transform into the white Kaiser, Engine Bro's. Compared to his brother, Rai is more outspoken and seems to be prideful with his abilities. He had tendency to mock his opponent to let his/her guard down. Rai seems to dislike Gentoku, calling him Seito's Kamen Rider in disgust. Nevertheless, both Fu and Rai are cruel and ruthless, and likes to torture their defeated opponents. Rai, along with Fu was first shown at Hokuto after Kiba defeats Seito Guardians as Owl Hazard Smash.

They quickly defeat the latter as Engine and Remocon Bro's easily and taunt Grease to become Seito weapon, if he wants Kiba to live. After they torture Kiba, Kazumi and Akaba arrives, and Kazumi rejects Rai's offer and fight him as Grease. Grease, along with Akaba and Kiba escapes, but later shot by Fu using Nebula Steam Rifle. Fu's about to kill Grease, if Kiba didn't took the bullet for him. Akaba later helps his boss escape once more, to Sky Road where Sento and Banjou awaits. As Washio brother finally caught up to them, Sento and Ryuga fights them as Build Rabbit Tank Hazard and Cross-Z Charge respectively, until Rogue make his appearance.

Publication Information

Fourze : Rai Washio
Japanese : 鷲尾雷
Version : Kamen Rider Build Series
Type : Raider from Seito
Known as :
- Engine Bro
- White Kaiser
Affiliation : Namba Heavy Industries Ltd
Relative : Fu Washio : Sibling Brother
Gender : Male
Origin : World of Build (Seito)
Season : Kamen Rider Build
First Appearance : Kamen Rider Build Episode 23 : The Phantom of the West
Last Appearance : ROGUE
Number Of Appearances :
- 4 : Build
- 1 : Miniseries
Potrayer : Yuudai Nasuda
Main View : Full Episod

Joining Seito's forces in an attack on the Touto government office, the Washio brothers covered Rogue as he went in to claim the Pandora Box, engaging Kamen Riders, Cross-Z Charge, Grease and Build before the latter caught up with Rogue. Eventually, the Kaisers succeeded in defeating the Sclashjelly Kamen Riders.

Forms

Engine Bros

Engine Bros
- Origin : Earth (Seito)
- Version : Kamen Rider Build Series
- Type : Kamen Riders
- Users : Rai Washio
- Announcement : Gear Engine! Funky! Engine Running Gear!
- Height :
- Weight :
- Appearances : Build Episode 23, ROGUE
Engine Bros is the white Kaiser, transformed into by inserting Gear Engine into the Nebula Steam Gun

Equipment

Devices:

Weapons:

Steam Blade

Hell Bros

Hell Bros
- Origin : Earth (Seito)
- Version : Kamen Rider Build Series
- Type : Kamen Riders
- Users : Rai Washio
- Announcement : Gear Engine! Gear Remocon! Funky Match! Fever! Perfect!
- Height :
- Weight :
- Appearances : Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~
Hell Bros is the fusion of Engine Bros and Remocon Bros.