Takehisa Yamaguchi

Takehisa Yamaguchi (山口 豪久), born as Tomoyuki Yamaguchi (山口 智之) (January 25 1945 - April 6 1986), played Joji Yuki/Riderman in Kamen Rider V3, Riderman being the partner of Kamen Rider V3. He also acted as suit actor for Riderman. He was credited as Satoru Yamaguchi (山口 暁). He was also known as Akira Yamaguchi (山口 あきら).

Takehisa Yamaguchi only returned in one episode of Kamen Rider (Skyrider). In the other 4 episodes where Riderman appeared, he was portrayed by suit actor Junichi Iwai (岩井 潤一) alongside assorted voice actors.

In 1984, he reprised his role alongside Hiroshi Miyauchi (Kamen Rider V3) and Shunsuke Takasugi (Kamen Rider Super-1) in Birth of the 10th! Kamen Riders All Together!! (1984), which introduced Kamen Rider ZX.

Sadly, Takehisa Yamaguchi passed away on April 6 1986, at the age of 41. He was the first actor who played a Kamen Rider to die. After his death, Riderman would be portrayed by several voice actors and suit actors in his later appearances.