Piccolo

Resistance Saga
After Garlic Jr. tried to have him killed Piccolo went to his fortress and teamed up with Goku to try and kill defeat him. After being bested by Garlic Jr. Piccolo was about to die from Kami being killed until Krillin distracted the monster. But it wasn't until Raditz and Gine arrived and defeated Garlic Jr. locking him away in the Dead Zone that they would win the fight. After seeing how strong the Saiyans were Piccolo went into seclusion to train his body and mind harder then every before. It wasn't until he sensed Gohan and Krillin in danger that he came out and showed off his new strength defeating Kochin's Bio-Men. After learning that the Dragon Balls were active he went off with Krillin and Gohan to see the Saiyans brought to Earth.