Joji Yuki (A.R. World)

Joji Yuki is a mysterious young man with a prosthetic arm who has the ability to become Riderman. He was a scientist who worked for Dai-Shocker and was involved in the production of the Decadriver and the Diendriver. For unknown reasons, Yuki rebelled against Dai-Shocker and was punished through the amputation of his arm. This has made him a wanted man in the Decade World.