Yenndo

“This mysterious endoskeleton will appear at random when closing your monitor. If he is in your office, open your monitor again to make him disappear.” — Custom Night description, Five Nights at Freddy's: Sister Location." "Yenndo is a Funtime endoskeleton and a minor antagonist from Five Nights at Freddy's: Sister Location. Despite his small role in the main game, he also appears in the Custom Night. Yenndo is an endoskeleton strongly similar to Funtime Freddy's." Yenndo is very similar to Funtime Freddy's endoskeleton (whose full body can be seen more clearly from the "Making of Freddy" section in the Extra menu), with complete lack of a suit-shell, to reveal very detailed endoskeleton wirings, somewhat resembling human muscle layers, although, he has three differences."