Piccolo is one great example of character redemption. He is the reincarnation of King Piccolo, the main antagonist inDragon Ball, but later becomes an important ally and part of the "Z warriors".

What Was Piccolo’s Role in Dragon Ball Daima? Piccolo was part of the main team that went to the Demon Realm alongside Goku, Vegeta, and Bulma to rescue Dende and collect the realm’s Dragon Balls.