|Affiliation||Generic; Deus ex Machina; bias|
Hahahaha... This is checkmate, Kirby. The game is up!
Nightmare is a generic doomsday enemy created by Sakurai to first show that King Dedede may not be a villain. Despite his being a one-off (only appearing in a Sakurai game, a remake, and cameoing in a mini game and some cards or something), he was the main antagonist of Kirby: Right Back at Ya! Although Sakurai apparently had some input in that show, so I guess it makes sense.
RoleEditAs stated above, he was a generic doomsday villain. But because he was created by Sakurai, bias set in, and he was given a role as an Assist Trophy... which actually disappointed people because they thought he'd be a better Stage Boss... even though everyone hates the Yellow Devil.
In the show, he sent monsters to Dedede, and the monsters would go and attack Kirby, but everything would work out in the end. Every week. For 100 episodes. Then he was defeated by a Deus ex Machina in about three seconds.
- He was probably the only Assist Trophy revealed that had absolutely zero support. Even Nightmare from Metroid came up more.
- Despite being a Sakurai creation, he somehow uses an ability that he never used in his game. That's right, the guy who updated Pit so that he reflected his game more and gave Dedede the only moveset in all of Smash based 100% on moves he's canonically able to use without outside help gave yet another one of his creations an attack that it's never used.