The Dragon Ball series is good at treating its viewers with amazing villains. One of the most memorable villains was Majin Buu, the final boss of Dragon Ball Z. At the start of his appearance, the fans and the characters didn't think much of him. Physically, he didn't look intimidating. However, Buu proved to be one of the most powerful characters in the series.
Source：https://www.cbr.com/dragon-ball-majin-buu-forms/
