Piccolo

Piccolo used to be much like his father, having no mercy or regard for his opponents, but he slowly began to change. After the battle with Raditz, he showed a more honorable side, commemorating Son Goku for sacrificing himself. Piccolo really began to change after training with Son Gohan, and when he fused with Nail, he started to fight in the name of the Namekians and to protect the innocent. However, Piccolo was still somewhat arrogant and ruthless, but his fusion with Kami allowed him to lose all traces of evil he once had. He has always been a loner, not talking much except if it’s about fighting, and has no understanding of romance. No matter if he is evil or good, he is a very adept teacher able to turn a barely trained four year old into a capable warrior in a year's time.