Kamen Riders who use the Prototype Powers:

-Kamen Rider Kuuga (Prototype) appeared in Kuuga Novel. This form use the Prototype Arcle, which lacks the Amadam Stone and could make the user go berserk. This arcle was created earlier than Kuuga, and the previous user was sealed in the Coffin Of Darkness. In the novel Mika Natsume found it and use it.

-Kamen Rider G3 Mild

-Kamen Rider Proto IXA (The First) appeared in SIC Hero Saga Edition

-Kamen Rider Proto IXA

-Kamen Rider Proto Birth

-Kamen Rider Zangetsu Watermelon Arms

-Prototype Armored Riders appeared in Zangetsu Stage.

-Kamen Rider Zerodrive

-Kamen Rider Proto Drive

-Kamen Rider Dark Necrom R, B, Y, P

-Kamen Rider Proto Snipe Level 1

-Kamen Rider Genm Level 1/Level 0

-Kamen Rider Build (Prototype) aka Shinobu Katsuragi who use the prototype Build Driver.