Question: how did majin buu come back?
Answer: Finally, Buu loses control of his anger, and splits into Good Buu and Evil Buu. ... He is later removed from Super Buu by Vegeta, and once the power of the Kais was removed from him, Super Buu reverted to the insane creature "created" by Bibidi, Kid Buu (the original Majin Buu).