Majin Duu (魔ま人じんドゥー, Majin Dū) is a Majin created by Marba using a Saibaman seed infused with the essence of Majin Buu and other factors. He is the second Majin created after Majin Kuu to serve Dr. Arinsu. He was an antagonist of the Daima Saga but becomes an ally during the battle against Gomah