Good Buu

"Buuuuuu!"

- Majin Buu's frequent cry.

Good Buu or Majin Buu (Funimation dub) is a character from Dragon Ball Z that started as an adversary of the protagonists. He was created by Bibidi many years ago as an ultimate killing machine that would enable Bibidi to conquer the universe. However, he was able to be sealed inside an egg and buried deep in the earth. In the present, Babidi, Bibidi's descendant, revives Buu and commands him to begin a rampage of death and destruction across the planet. After proving too powerful for the Z fighters, Buu murders Babidi when he grows tired of following his orders, and continues his destruction spree.

The supposed world martial arts champion, Mr. Satan, later approaches Buu and convinces him that killing and destroying is wrong, and Buu decides to stop doing it. The two become friends, but not long after, a deranged gunman nearly kills Satan and a dog named Bee that the pair had adopted. Seething with anger, Buu expels a cloud of steam, which forms into Pure Evil Majin Buu, a manifestation of all of the evil that existed in Buu's heart. The two Boos fight, but Pure Evil Buu turns Buu into chocolate and eats him, transforming him into Evil Majin Buu.

Much later, as the Z warriors, Son Goku and Vegeta are fighting Pure Majin Buu, a later transformation of Evil Buu, Mr. Satan scolds Pure Buu, who is unable to kill him due to the affection the original Buu once felt for him. Pure Buu then expels the original Buu, who in turn fights against Pure Buu on the side of the Z warriors. After a prolonged battle, Goku is able to kill Pure Buu with a Chou Genki Dama, and he and Vegeta discover the original Buu, barely alive. After some debate, Goku and Mr. Satan convince Vegeta to spare Buu, since he helped them fight Pure Buu and the evil has been expelled from his heart. "Mr. Buu" then becomes a permanent Z warrior and lives with Satan.