Japan Action Enterprise had announced the list of Suit Actors appearing in Kamen Rider Zero-One. Among the list there was an unexpected name. It was Mr. Kamen Rider → Seiji Takaiwa.
His name was listed in the fourth place for Episode 4 which will air on September 22. It is not known what role he will play but could play Kamen Rider Horobi. Because Episode 4 could be perfect episode if Horobi needs to make appearance as long as he doesn't appear in Episode 1 just like Night Rogue.
While going through the list I came up with the names who could be the Suit Actors for Kamen Rider Vulcan & Kamen Rider Valkyrie.
Kousuke Asai might play Kamen Rider Vulcan. He had previously played Kamen Rider Cronus, Kamen Rider Decade (in Zi-O), Zyuoh Eagle, Lupin Red, Gavan, Kamen Rider Fuma & Kamen Rider Zonjis.
Satoshi Fujita might play Kamen Rider Valkyrie. He is know for playing many female Riders which includes Clay Doll Dopant, Mezool, Female Zodiarts, Kamen Rider Mage, Kamen Rider Marica, Kamen Rider Jam.