Majin Buu

Majin Buu is one of the main villains of the Dragonball Z series. He was created by the evil wizard, Bibidi, to do evil deeds for his own purposes. However, Buu became far more dangerous so Bibidi sealed him in a giant cacoon-like shell where he will be imprisoned for the next few generations. Decades later, he was released by his son, Babadi, just so he could continue the task his father started centuries ago. However, Buu turned on Babadi and killed him instead. He later became a good friend to Mr. Satan and a good ally to Goku and the Z Fighters. When Buu becomes angered at someone who intended on hurting others that are his friends, he utterly unleashed his evil side which fought Goku and the Z Fighters.