This article is about a/an pawn in Kamen Rider Build.

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

Character History

Accompanied by a squad of Faust Guardians, Nebula Hell Bro's 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, Sento assumed KirinCyclone to engage the Bikaiser before switching to KujiraJet to defeat him. With the Kaiser transformation canceled, Sento noticed he was a mere amnesiac and took him 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 Bro's which, upon inserting the Remocon and Engine Gears, transformed him into the complete Bikaiser Hell Bro's. Next Chapter

Nebula Hell Bro's

Nebula Hell Bro's
Nebula Hell Bro's

Nebula Hell Bro's


  • Height: 202.0 cm.[1]
  • Weight: 108.0 kg.[1]

Ability Perimeters:

  • Punching Power: 41.6 t.[1]
  • Kicking Power: 50.6 t.[1]
  • Maximum Jump Height: 64.8 m.[1]
  • Maximum Running Speed: 100 m. per 1.4 sec.[1]

Nebula Hell Bro's (ネビュラヘルブロス Nebyura Heru Burosu) is the prototype of the Hell Bro's Bikaiser.

Unlike the completed Kaisers, the Nebula Hell Bro's is more similar to the non-Hard Smash in that the transformed subject's memory is wiped. As such, their awareness is impaired and they are compelled to rampage.

Appearances: Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~



Behind the scenes


This Nebula Hell Bro's is portrayed by an unidentified actor and suit actor.


  • Unlike the original Bikaiser, Nebula Hell Bro's appears with a brown undersuit as opposed to black.



Sento Kiryu (Takumi Katsuragi) - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto - Nariaki Utsumi - Shinobu Katsuragi - Kengo Ino - Killbus - Keiji Uraga
Transformation Gear
Fullbottles - Build Driver - Transteam Gun - (Great) Cross-Z Dragon - Sclashjellies - Sclash Driver - Hazard Trigger - Nebulasteam Gun - Cross-Z Magma Knuckle - Evol-Driver - Evol-Trigger - Grease Blizzard Knuckle - Killbuspider - Grease Perfect Kingdom
Drill Crusher - Hawk Gatlinger - 4Koma Ninpoutou - Kaizoku Hassyar - Fullbottle Buster - Steam Blade - Beat Closer - Twin Breaker - Muscle Glove - Solstall Wings - Giant Scratcher - Space Ride Arm - Spine Knuckle - Long Range Cleaner - Trash Converter - Gold Lio Gauntlet - Multi Deluge Gun
Pandora Box - Halfbodies - Fullbottle Holder - Build Phone
Vortex Finish - Hazard Level - Project Build - Sky Wall - Nebula Gas
nascita: Misora Isurugi - Soichi Isurugi - Sawa Takigawa - Kazumi Sawatari - Gentoku Himuro
Prime Ministers: Taizan Himuro (Touto) - Yoshiko Tajimi (Hokuto) - Masakuni Mido (Seito)
Namba Heavy Industries Ltd.: Juzaburo Namba - Nariaki Utsumi - Haruhiko Wanibuchi - Guardian
Hell Bro's: Fu Washio - Rai Washio - Yoshikazu Takahashi - Norio Matsui
Aliens: Vernage
Downfall: Keiji Uraga - Simon Marcus
Gentoku Himuro - Evolto - Nariaki Utsumi - Takumi Katsuragi - Shingo Kuwata - Eita Kawai - Yoshikazu Takahashi - Norio Matsui
Touto: Needle Smash - Strong Smash - Burn Smash - Flying Smash - Mirage Smash - Square Smash - Press Smash - Ice Smash - Stretch Smash
Hokuto: Castle Hard Smash - Stag Hard Smash - Owl Hard Smash
Kaiser: Kaisei Mogami (World of Ex-Aid)
Kengo Ino - Ryoka Saiga - Mitsuomi Gobara - Evolto - Killbus
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