Majin Buu

Buu has numerous counterparts in the series. When he first emerges from his shell, he is tall and round, and his personality is naive and innocent. The first form of Buu kills Babidi, however soon befriends a human named Mr. Satan, and later a puppy which Buu finds and heals after he'd decided to go on a killing rampage. After realizing that the puppy liked him, Boo names the puppy Bay (Bee in English). Despite Boo's sudden change of heart, two gunmen destroy his house and attempt to kill Bay and Mr. Satan. Due to his rage at the gunman, Boo's anger manifests itself in the form of another Buu ("The Buu of Pure Wrath").

After a battle with the superior Buu of Pure Wrath, Buu is absorbed and the two combined create Super Buu, who tracks down the protagonists of the series Piccolo and Gotenks. After absorbing them, Buu is faced by another character named Son Gohan. After absorbing Son Gohan, Buu is confronted by the character Vegetto, where he is forced to separate from all the characters at which he'd absorbed, including the Good Bu. As a result, he reverts to his purest form, the original child state called "The Buu of Pure Evil." After a long hard battle, the characters Son Goku, Majin Buu, and Vegeta topple Kid Buu.