ライダーマン
Enemy, and later ally, of [[kamen_rider_v3|Kamen Rider V3]]. Also known as the "Avenging Demon".

A former scientist of the Destron organization framed as a traitor, Jouji Yuki takes up the name of Riderman to eliminate V3 and clear his name.

Riderman is not named the 4th Kamen Rider until [spoiler]he sacrifices himself to redirect a missile bound for Tokyo.[/spoiler]

His distinguishing features include his mechanical right arm and helmet that exposes the lower half of his face.
riderman