Gyumao

Gyumao is based on Niúmówáng (“Ox-Demon-King”, “Ox Devil Lord” or “Ox Tyrant”) a character from the Chinese novel Journey to the West.

As the series progresses, Gyūmaō’s role lessens in the story and eventually fades into being a background character, used only for slight comic relief. Gyumao is also the grandfather of Gohan and Goten. In anime filler, he has a few large roles though from time to time, mainly accompanying his family and the others.