Uubu

Uubu is the Human reincarnation of Evil Buu, he grows to adolescense in the ten year calm after Evil Buu's destruction. Uubu enters the first World Martial Arts Tournament in ten years, in order to take home the multimillion Zeni prize, to feed his village. However, Uubu is unaware that Goku has been waiting to fight him his whole life, yet Uubu had never met Goku in this life. Goku then has Majin Buu rig the Tournament's random selection system so that Uubu and Goku are the first fighters to combat.

Uubu enters the ring with Goku unsure of his abilities, but with fierce determination to help his village. As the fight is declared Goku begins to taunt Uubu in order draw out Uubu's incredible potential power level[?]. Goku remains at a comfortable level as Uubu draws out his first burst of power, lunging forward with a powerful melee attack. The strength of the attack caught Goku offguard and the battle commenced.

After some eye popping sparring[?] Goku touches the ground and explains his actions to Uubu, as they were necessarily rude in order to enrage him.