Jouji Yuuki  

Riderman, 結城　丈二

Jyoji Yuuki was a scientist for Destron until one of its agents falsely accused him of treason. As punishment, he was dipped in acid which resulted in the loss of his right arm. To clear his name, Yuuki decided to become Riderman and defeat Kamen Rider V3. After finding out the truth about Destron from V3, he joined the fight against this evil organization.