Nightmare (or Nightmare Wizard) is an evil magician who is the personification of bad dreams and nightmares. He tried to spread Nightmares all across Dream Land by corrupting the Fountain of Dreams, but was stopped by Kirby and King Dedede. He still hasn't stopped trying to spread nightmares and darkness throught other worlds though. He also runs Nightmare Enterprises, a company that is a front for his armies and creates a profit by selling monsters.

Nightmare comes from "Kirby's Adventure".