Gennosuke Yumi

Gennosuke Yumi is a former colleague of Juzo, Kouji's grandfather, and heads the Photon Power Research Laboratory. He is Sayaka Yumi's father and the creator of her robot Aphrodai A. In Shin Mazinger Shougeki! Z-Hen, his name is changed to Yannosuke despite earlier Mazinger works using Gennosuke.