Nightmare

Nightmare is owned by Scott Cawthon.

Nightmare
Nightmare is a shadowy incarnation of Nightmare Fredbear. His current appearance is only in Five Nights at Freddy's 4.

He replaces Nightmare Fredbear on Nightmare and 20/20/20/20 mode after 4 AM.

In the Halloween Edition, he is replaced by Nightmarionne.

Trivia
Nightmare is the 2nd animatronic with a killscreen. If an image with Nightmare is brightened, it is revealed that Nightmare is translucent.
 * The first is Golden Freddy from Five Nights at Freddy's, and the third is his Halloween counterpart, Nightmarionne.