They're a creative bunch sometimes! xD Personally, I think it's cool to cosplay a character and find new friends with similar interests (such as gaming/FNAF/etc.). So, it's foin by me. Sometimes you will find some obnoxious users out there, too, and part of the big spooky-scary flavor of FNAF comes inherently from the characters they're portraying.
But, so long as they're kind OOC, and playing nicely, they're alright. c: