Yenndo

Yenndo is one of the five animatronics introduced in the Five Nights at Freddy's: Sister Location Custom Night. He is an endoskeleton bear similar to Funtime Freddy's endoskeleton. He can also be seen as an Easter egg in Funtime auditorium on nights 3 or 5.

Appearance
Yenndo's appearance is identical to Funtime Freddy's endoskeleton, but with few differences - a lack of "face-frames", having both hands (which would include the lack of Bon-Bon), screw without the hat and yellow irises instead of sapphire blue. He can appear in Funtime Auditorium rarely as an Easter egg, and can appear in the Custom Night.

Behavior
Yenndo will randomly appear in the Private Room office in Custom Night. He will then rapidly drain the player’s oxygen until it's low enough so he can jumpscare them. If he appears in the office, the player must put up the monitor as soon as they see him. If the player fails to pull up the monitor, he will attack. Yenndo also helps Bonnet because of him draining their oxygen causing them to not see anything like Bonnet's nose.

He can also appear in Funtime Auditorium as an easter egg. He does not attack the player when appearing, he also doesn't twitch or move.