This article is about a/an monster form used by several identities in Kamen Rider Build.

The Flying Smash (フライングスマシュ Furaingu Sumasshu) is a Smash with several different forms and identities.

Known Identities


The first Flying Smash was Reika Kine. Going on a frenzy, the Smash tried attacking Reika's son Kota before being fought back by Build. The Flying Smash was eventually defeated by Build GorillaMond, returning Reika to her human state, to the joy of her and her son. Borderline of Justice

The second Flying Smash was created when Shingo Kuwata poured an unpurified Fullbottle onto himself, becoming the Smash to fight Build and lead him away from the Touto Institute of Advanced Matter Physics so Faust could attack without his interference. It was defeated by Build LionCleaner. The Trap of Project Build

An unidentified test subject was transformed into the Flying Smash Hazard before being sent alongside a Press Smash Hazard to attack Touto on behalf of Hokuto. He was freed when he was defeated by Kamen Riders Build and Cross-Z. The Weaponry Hero

A Flying Clone Smash was summoned by Evolto-Ryuga Banjou alongside the second Strong Clone Smash and a pair of Hard Guardians against Kamen Riders Build and Grease. Along with the Strong Clone Smash, it was eventually destroyed by Grease's Scrap Finish Rider Kick. Evolto Hunts Stars


Flying Smash
KRBu-Flying Smash

Flying Smash

One of the possible Smash created when a subject with Hazard Level 2 is dosed with Nebula Gas. It can fly by flapping its arms.

Appearances: Build Episode 3, 9

Flying Smash Hazard
KRBu-Flying Smash Hazard

Flying Smash Hazard

A stronger version of the regular Flying Smash made by the same process. The reason a subject becomes a Hazard Smash instead of a regular Smash is unclear, though it may result from a more refined or advanced method.

Appearances: Build Episode 16

Flying Clone Smash
KRBu-Flying Clone Smash

Flying Clone Smash

An artificial copy of a Smash not requiring a test subject, even stronger than the Flying Smash Hazard. Though lacking intelligence, it does not feel pain and will continue fighting until destroyed.

Appearances: Build Episode 36, 41, 45

Powers and Abilities


  • Air Slash Claws (エアスラッシュクロー Ea Surasshu Kurō): Large blunt claws made from its "wing feathers" it can slash opponents with and fly. The one that manifested in Reika could also also fired energy needle variations.
  • High Body Heat: The Flying Smash can briefly increase its body temperature to burst through walls. This was used by the one that manifested in Shingo to escape from Sento.

Smash Bottle

Flying Smash Bottle

Smash Bottle
(Flying Smash)

This Smash Bottle contains the essence of the Flying Smash.

Behind the Scenes


Both Flying Smash were portrayed by suit actor Hajime Kanzaki (神前 元 Kanzaki Hajime). The Flying Smash Hazard was portrayed by Jun Watanabe (渡辺 淳 Watanabe Jun).


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