Goro Numata

Goro Numata (沼田 五郎) or Kikkaijin Spark (奇械人スパーク) is a disused Kikkaijin after an unsuccessful surgery.He was Shigeru Jo's best friend and the basic prototype of Kamen Rider Stronger. In the Manga Kamen Rider Spirits,he was resurrected by Badan Empire but later Shigeru used Spark's components to activate himself and transform into Kamen Rider Stronger.