Springtrap mask by art-by-AnnaSandgren on DeviantArt
Amazon.com: Springtrap Costume
What if for Springtrap's jumpscare in Fnaf 3 he Removed his mask revealing his mangled human face inside staring at you. (In my opinion that would have been a lot scarier) :
Springtrap Cosplay Five Nights at Freddy's FNAF - Etsy Hong Kong