go on to Master Roshi

Majin Buu was created 300 years ago by the evil sorcerer Bibidi. At one time, there were four powerful Kaioshins, until Majin Buu killed all but one. The remaining Kaioshin used the Potara earrings to fuse with Buu, thus giving him his fat appearance. He was then sealed away, only to be resurrected by Bibidi's son, Babidi. Fat Buu was not as evil as we had thought he was, and becomes friends with Mr. Satan. But fat Buu gets mad and creates another form. One being the original fat Buu, and the other, evil Buu. With the power to absorb other life forms, Evil Buu absorbed fat Buu and many of the Z fighters and became even stronger. Gokou and Vegeta go inside of him, get their friends that were absorbed out, and escape through Majin Buu's mouth. Buu is later killed by a Genki Dama from Gokou, but not before spitting out fat Buu, who spends the rest of his days living with Mr. Satan. 5 years after Buu is killed, Gokou makes a wish that he will be reincarnated into a cleansed form so he can spar with him, which happens to be a poor black child named Ubuu.