normal nightmare
Nightmare, sometimes called Cloaked Nightmare is the main antagonist and final boss of Kirby's Adventure and Kirby: Nightmare in Dream Land.
Anime
Nightmare is also the main antagonist in the Kirby anime, Kirby: Right Back at Ya! Although he is rarely seen, save for his silhouette in the background on occasion, he is the one who creates the monsters that Kirby fights on a regular basis.