In the first series Piccolo Daimo is a bad guy that is hooked on killing Goku. Finally Goku kills him and he spits out an egg, within this egg is a baby namek called Piccolo. While he was dying Piccolo Daimo swore that he would be avenged by his son and almost was if it hadn't been for the arrival of Raditz. With the arrival of an extremely powerful enemy, Goku and Piccolo were forced to team up and defeat that monstrosity. If it hadn't been for Raditz Goku would probably be dead. After defeating Raditz Piccolo takes Goku's son Gohan and trains him military style. While training Gohan Piccolo learns to love the kid and discovers that he is not entirely evil. During the Nappa fight Piccolo sacrifices his life to save Gohan. Piccolo was trained by himself and only himself.