Majin Buu

Majin Buu (魔人ブウ), later known as Mr. Buu (ミスター・ブウ) is the first form of Buu seen in the Dragon Ball series. Majin Buu takes many forms, and all of the forms are simply referred to as "Majin Buu" in the series, but the various forms get their common names from various Dragon Ball Z video games. According to Daizenshuu 1, Majin Buu was inspired by Akira Toriyama's third editor, Fuyuto Takeda.

Background
Majin Buu is a creature that had existed since time immemorial. He was summoned from out of his long slumber 5 Million years Before Age, by the evil wizard Bibidi, in order to take over the universe. The fat version of Majin Buu is the result of Ultra Buu's absorption of Grand Supreme Kai, the supreme ruler of all Kais. The merging of the juvenile and immature Kid Buu with the benevolent and innocent Grand Supreme Kai resulted in a childlike carefree being who, despite his behavior, possesses power that far surpasses that of a Super Saiyan 2. Of note, absorbing Grand Supreme Kai granted Majin Buu the ability to speak fluently, although he usually refers to himself in the third person. Buu became calmer and easier to control after absorbing the Grand Supreme Kai, and Bibidi then decided to seal him in a Sealed Ball.

Voice Actors
all information on Majin Buu came from http://dragonball.wikia.com/wiki/Majin_Buu
 * Japanese :
 * English :