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Eita Kawai is a member of the Touto Institute of Advanced Matter Physics who is secretly an agent of Faust and an antagonist in Kamen Rider Build.


A researcher at the Touto Institute of Advanced Matter Physics, Eita Kawai was a colleague of Sento Kiryu and secret member of Faust who later took part in Faust's theft of the Pandora Box.

While Shingo Kuwata distracted Sento Kiryu, Eita Kawai lowered the security of the Institute so Blood Stalk and his squad of Faust Guardians could move in and claim the Pandora Box.

He allowed Blood Stalk to turn him into the Press Smash Hazard so he could hold off Ryuga Banjou. After being defeated by Ryuga, Kawai was reverted to his normal state by Blood Stalk with Cobra Steam Break. He accused Blood Stalk of being Takumi Katsuragi, the "Devil's Scientist", to which Blood Stalk responded to by changing his face to look like Shingo Kuwata's and rendering him unconscious.

           BUILD LOGO.png Villains

Night Rogue | Blood Stalk | Takumi Katsuragi | Nariaki Utsumi | Shingo Kuwata | Eita Kawai | Masahiro Nabeshima | Norio Matsui | Yoshikazu Takahashi | Shinobu Katsuragi | Faust Guardians

Yoshiko Tajimi | Blood Stalk | Kazumi Sawatari | Hokuto Three Crows | Akaba | Aoba | Kiba | Massugu Ubukata | Hokuto Guardians

Masakuni Mido | Kamen Rider Rogue | Fu Washio | Rai Washio | Seito Guardians | Hard Guardians

Namba Heavy Industries Ltd.
Juzaburo Namba | Nariaki Utsumi | Fu Washio | Rai Washio | Sawa Takigawa | Kaisei Mogami | Guardians | Hard Guardians

Blood Tribe
Killbus | Evolt | Kengo Ino | Ryoka Saiga | Mitsuomi Gohara

Needle Smash | Strong Smash | Burn Smash | Flying Smash | Press Smash | Ice Smash | Stretch Smash | Fang Smash

Simon Marcus | Keiji Uraga | Phantom Crushers | Guardians | Hard Guardians