Emperor Pilaf

Pilaf is the first major villain from Dragon Ball. He wants the Dragon Balls to rule the world.

Story
Pilaf is a tiny imp who rules a giant isolated castle. He has just two followers, Shu and Mai, whom he loves to torture for their failures. Pilaf got one of the dragon balls and just waited for someone to arrive at his castle looking for his ball. As Goku and his friends came, he immediately sent his two henchman, who imprisoned them and stole the dragon balls from them. With all the dragon balls, Pilaf summons Shenron to realize his wish. Goku tries to escape using a Kamehameha, but it only made a hole on the wall, from where Oolong managed to escape by turning into a bat. As Pilaf was about to ask his wish, Oolong jumps in and immediately asks for a girl's underwear, which Shenron grants to him. Pilaf obviously get mad and catch them again, but Goku turns into a great ape and starts rampaging, destroying Pilaf's castle in the process. Pilaf tries escaping in a plane and shots a bomb at Goku, which merely knocks him out. Goku returns to normal and Pilaf flees.

Some time later, after the Red Ribbon army is defeated, Goku gets all the dragon balls except for one. By going to the fortuneteller Baba, Goku finds it with Pilaf, who discovered a way to block the Dragon Radar to locate the dragon balls. He uses a gigantic robot to fight Goku, only to be defeated again. He later releases King Piccolo from his confinement in hopes he would help him conquer the world, only to be betrayed by him.

Much time later, Pilaf manage to enter the Kami Lookout and summon the Red Shenron from the Black Star dragon balls. As he argues with Goku, he asks that he wanted Goku to be small again, so he could stomp him. The Dragon mistakenly interprets this as a wish, and turns Goku into a kid. Pilaf wasn't seen again after this.

Personality
Pilaf is much like a spoiled kid, who cries when he doesn't get a candy. He is also rather pompous and thinks that he is destined to rule the world.