Raditz

Raditz is Goku's brother and first antagonist of the series. While he doesn't appear in many episodes, Vegeta and Nappa often joke about how weak he is. Raditz is also used as a unit for measuring power levels and later as a unit of currency. He is said to have beaten King Yemma in other world and bloodied someone in Hell. He is wandering the universe somewhere, because King Yemma mentioned that Raditz kicked him in the balls and ran off somewhere.