Mystery Bear

Mystery Bear is one of the easter eggs present in Five Nights at Freddy's 3, where a Freddy suit appears in the office.

Physical Appearance
Mystery Bear is a dark recolor of either Golden Freddy or Shadow Freddy. He also seems to have his right arm almost falling from the body.

Supreme Custom Night
Mystery Bear would appear on the cameras and cause the player to see everything in a distorted, trippy way.

Supreme Custom Night: Revival
To be revealed.

Trivia

 * The name Mystery Bear was given because of the mystery surrounding his existence.
 * It also came from the fact fans were unsure if it was Phantom Golden Freddy or Phantom Shadow Freddy.