He has the same appearance from Five Nights at Freddy's 2. He is a golden and eyeless version of Freddy Fazbear from all Five Nights at Freddy's games.
When he is in the Show Stage (in Five Nights at Piggy's 3), he has his original appearance, just in a static form.
When he is in the hallway by the Office, he has the appearance of the image shown above the text.
He Shows At Show Stage And Office