Kid Buu is one of the creations of Babidi. Kid Buu is really Majin Buu but in the form when all the fighters were removed from his system. He is pure Evil and he eventually gets stopped by Goku and Talina's Spirit Bomb. But he comes back and it takes many years to reach his full form. He comes back and is stopped by Majin Buu but in the process Majin Buu is also killed. He now resides in hell.