This is Rich Raccoon, a secondary 'character' from the Freddy Fazbear Entertainment Show.
He's a cranky, pun-loving rascal who lives in the garbage and lives off of discarded pizza crusts!

At night he becomes more active the more he's caught on camera (as, on stage, he only activated during the time spotlight is shone on him and is otherwise dormant inside his garbage can).
The first few nights he's still in his can, so you (The Player) can hear him scraping around which is a ploy to have the you check the rooms more often, and can appear in the Security Room without warning is viewed too frequently (FNAF1 setting). The only way to get him out of the room is to pull up the Security Camera Pane for several seconds until he eventually wanders out (with audio cue of either his garbage can scraping or his wheels squeaking). This leads to potentially dangerous situations where Bonnie or Chica are waiting at a door and can cause a Game-Over when the Security Camera Pane is dropped.

The remaining nights he is seen without his garbage can and can wheel himself quickly from room-to-room, though if it has garbage he might be noisey and thus attract more attention. On rare occasion Rich will appear without his 'nose', in which he is more likely to attack and end the game if you're not quick enough pulling up the Security Camera Pane. This only happens on Nights 5 and 6, or Custom Night mode when Rich's difficulty is set above 12.