Gennosuke Yumi (also called Yanosuke Yumi in the Shin Mazinger material) is the name of a character who usually serves as an advisor to the main character, father to his love interest, and leader of the facility he is associated with.
- Gennosuke Yumi (Manga): The current director of the Photon Lab in the original manga
- Gennosuke Yumi (TV): The creator of the Aphrodite A and Diana A in the anime and TV Magazine manga
- Gennosuke Yumi (MazinSaga): The president of FUJI
- Gennosuke Yumi (Z Mazinger): A Nobel prize winning scientist who made Z Mazinger from the remains of Zeus
- Gennosuke Yumi (Kaiser): The director and advisor to the Photon Lab forces in the OVA
- Yanosuke Yumi: The differently named but same overall character in Shin Mazinger
- Yanosuke Yumi (ZERO): The successor to Juzo Kabuto with the same role as his other counterparts.
- Gennosuke Yumi (ZIP!): The overprotective father of Sayaka and eccentric director of the Photon Power Laboratory.