*Kid Buu ("Demon Person Boo (Pure)") is the original, pure form of Majin Buu. Unlike his other forms, this form of Buu's thought process is seen to be irrational and spontaneous, even destroying his own body to destroy the Earth.

Although he appears smaller than any other form, he is more dangerous than any other forms of Buu due to his full relentless evil and unpredictability. He is also completely free of restraint and has no trace of sanity and, because of this, is extremely volatile. He retains his childish personality, becoming amused and laughing hysterically at his own destruction of entire worlds.

He is the main antagonist for the Kid Buu Saga, the final antagonist of the Majin Buu Saga, and the overall final antagonist of Dragon Ball Z.

Kid Buu's personality is very similar to that of a very young, spoiled, selfish child, in that he retains no form of compassion or remorse for any of his actions.

Kid Buu is almost identical in terms of appearance to that of Super Buu, with the exception that he is childlike in terms of stature and his antenna is also shorter than Super Buu's. In the manga, Kid Buu does not have any fingers besides the small index finger, but in the anime and in video games, he has the regular four fingers and a thumb. Just like the other Buus, he wears baggy white pants with a black belt showing the Majin symbol.

Like Super Buu, he wears black arm covers and black boots with a similar yellow pattern ending in grayish brown shoes.

Furthermore, due to his selfish and capricious personality and mind-set, he is incapable of developing empathy and comprehending the nature of his actions. It can also be said that Kid Buu is very similar to that of a low-functioning sociopath.

Kid Buu is also, like a child, very unpredictable in his behavior and actions, sometimes randomly falling asleep during battle or acting like a monkey by banging his chest with his fists.*