Nebula Hell Bro's

This unidentified man was abducted and exposed to Nebula Gas before being transformed into the Nebula Hell Bro's (ネビュラヘルブロス), a prototype for the new Hell Bros Bi-Kaiser model developed by Nariaki Utsumi, on behalf of Namba Heavy Industries Ltd..

Character History
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 Bi-Kaiser, 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 Bi-Kaiser before switching to KujiraJet to defeat him. With the Kaiser transformation canceled, Sento found a mere amnesiac whom he took to safety. Meanwhile, Nariaki Utsumi, having used the battle to finalize the new Bi-Kaiser he created, recovered the Nebula Steam Gun left behind by the Nebula Hell Bros which, upon inserting the Remocon and Engine Gears, transformed him into the complete Bi-Kaiser Hell Bros.

Nebula Hell Bros
Nebula Hell Bro's Nebula Hell Bro's (ネビュラヘルブロス)

Devices

 * Nebula Steam Gun - Transformation device and sidearm

Appearances

 * Icon-build.png Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~
 * First Chapter
 * Next Chapter