Brightening up this image reveals that this creature is purple in color as with several other key items/characters in the franchise, bearing comparisons to the purple figure from the secret mini-games, the Marionette's 'tears,' Nightmare Fredbear's hat and bowtie among other things. It appears to be in a slumped position, similar to that of Golden Freddy's.
He will shut the game off if the player observes him for too long (without a jumpscare), much similar to Golden Freddy's role in the first game or Nightmare's effect in the fourth. It appears in Parts/Service, sitting in the location Bonnie normally sits. In Five Nights at Freddy's 2, the player may rarely encounter what seems to be a shadow or a dark model of Golden Freddy, who is in fact Shadow Freddy. He is an easter egg in Five Nights at Freddy's 2, the secondary antagonist of Five Nights at Freddy's 3, and a minor antagonist in Freddy Fazbear's Pizzeria Simulator.
Shadow Freddy is a supporting antagonist throughout the series.
