Publication Information
- Title : Washio Brothers
- Japanese : 鷲尾兄弟
- Version : Kamen Rider Build Series
- Type : A pair of siblings from Seito
- Affiliation : Namba Heavy Industries Ltd
- Gender : Male
- Origin : Earth
- Season : Kamen Rider Build
The Washio Brothers are a pair of siblings from Seito who serve alongside Gentoku as their country's main troopers. Using the Kaiser System that was developed by Kaisei Mogami and upgraded by Nariaki Utsumi, the brothers share a single Nebula Steam Gun that they use to transform.
Pair of siblings
Fū Washio
- Main Article : Fu Washio
- Fū Washio is Rai's older brother who uses the Gear Remocon to transform into Remocon Bros, a green-colored version of Kaiser. Although he primarily uses the Nebula Steam Gun in combat, Remocon can also utilize its Rifle Mode should Engine lend him the Steam Blade.
- Main Article : Rai Washio
- Rai Washio is Fū's younger brother who uses the Gear Engine to transform into Engine Bros, a white-colored version of Kaiser Reverse. As Remocon is the primary user of Nebula Steam Gun, Engine utilizes the Transteam System users' Steam Blade as his main weapon.
