Seikichi Mochizuki

Seikichi Mochizuki (望月 清吉) is the grandfather of Hiroshi Mochizuki and the father of Doctor Mochizuki. A scientist like his son, albeit a harmless and benign one, he took care of his grandson following the Doctor's disappearance.

The Masked Rider: Kamen Rider ZO
Through his appearance in ZO, Seikichi Mochizuki is featured in The Masked Rider: Kamen Rider ZO.

Portrayal
Seikichi Mochizuki was portrayed by Hiroshi Inuzuka (犬塚 弘). In The Masked Rider: Kamen Rider ZO, he is dubbed by an unidentified voice actor.