Master Jemezu

Jemezu (ジャイメズ) is a human, the descendant of Krillin, and the great-grandfather of both Jeiku and Dina. He trained not only his great-grandson, but the Saiyan Son Benkei for a while too.

Background
Jemezu was born in Age 900 to a buisnessman father and a stay-at-home mother. Always needing a thrill in his life, he grew up reading stories about his ancestor, Krillin, and the other Z-Fighters. After overhearing about the Martial Arts Master Vegeta Jr, a young Jemezu traveled there to train with him. He constantly had rivalries with another student, Raimaru, and the two later moved on from Vegeta Jr's training still as rivals.