Kid Buu is the original form of Majin Buu. In this form Buu seems to be the most dangerous when his thoughts are not alert, merely killing and destroying.
Kid Buu was born with the universe, absorbing the evil in the universe and becoming stronger. He travels all over the universe and destroys the planets and goes through many dormant periods. About 5 million years before the story of Dragon Ball, Majin Buu was awakened by Bibidi but he could not control Buu so he lied that he was Buu. They both went to the Kaioshin shrine, Kid Buu killed West Supreme Kai and North Supreme Kai before absorbing South Supreme Kai.
Buu’s primary strength is defeating SSJ2 Goku and SSj2 Vegeta even though they are not really in the best shape at the moment. It can be seen that Kid Buu is level with SSJ3 Goku, although Goku declares that he can defeat Buu by fighting Super Saiyan 3 with 100% strength. Vegeta and Goku underestimate Kid Buu about his height but Shin says that this is the most dangerous moment for uncontrolled consciousness.
Kid Buu’s strongest attack, Planet Burst (in the anime), is said to have destroyed Earth ten times, making it so strong that Goku notes that even he and Vegeta can not stop him. block it. Buu is able to repel Goku’s Genki Dama if he does not regain his strength, knowing that pure hearted people can handle this attack (Buu is a pure hearted person).
Kid Buu has the ability to regenerate indefinitely so do not tire of fighting for long periods of time.