he's name is D.E.F.O.R.M.O it's a combination of boncon soul(wafflerabbit/icujius) and sponx he will appear in night 6,if you get all 5 plushies you free the soul inside of him(gabriel) and you get the good ending but if you don't get the plushies you get the bad ending(he dies but the nightguard goes insane)