Mr. Satan
The world martial arts champion from Dragonball, he becomes the champion easily to due none of the z fighters entering the tournament at the time.
Android 18 let's him win the final battle in exchange for the
prize money and another 10 million
zeni.
In the fight between
Vegito and
Super Buu, Mr. Satan is able to see the fighters while they move and fight, while unable to sense energy, however
Gohan, during the Saibaman struggle, could not see the fights until he concentrated on their energy, and not using his eyes. This is another plothole of the series.
Almost every time Mr. Satan has to come to the ring in the World Martial Arts Tournament, he usually ends up hurting himself, then he is forced to lie to the crowd saying that he was kidding around in order to keep his reputation.