Piccolo
Piccolo is kind of like Vegeta because he was first a bad guy then turned into a good guy. Piccolo was formed from King Piccolo(the first one)
because when Goku went right through King Piccolo's stomach. King Piccolo spit out an egg and are Piccolo hatched. Later Piccolo jioned forces
with Goku to defeat Raditz. After the battle Piccolo new Gohan had a lot of power in him and Gohan needed to learn how to control it. So Piccolo
dicided to train Gohan. He does a permanant fusion with Nail and Kame so he is pretty powerful. But even though he's not the main character he
has a good roll in the show.
