Majin Buu is the Strongest of all of the villains in DBZ. He was created by the evil Babi di. After wreaking havok around the universe he was finally sealed up and imprisoned. He has the ability to absorb other people by either changing them into food items (such as chocolate) or by wrapping himself around them and absorbing them. His shape is determined by whoever the last person he absorbed was. He was befriended my Mr. Satan and the good side of him was brought out. After the near fatal shooting of Mr. Satan the good and the bad in Buu split and fought, the bad won and after that Majin Buu was totally evil. Buu was finally defeated by SSJ3 Vegitto and all of the people that he ate or absorbed were brought out including good Buu. Later Buu was brought back with the dragonballs as Uub and was a good guy from then on out.