In all honesty, Vespian's never been a fan of Five Nights at Freddy's. I mean not to sound cruel nor step on a few toes but this is my sole view of the game. Aye, I've heard from friends of the game's whole story line with the parlor bein' haunted by young children who have deceased/been murdered there but, again in my honest opinion, I feel like he could have done better with the game, better with the plot at least. Don't get me wrong, is it a good plot, but there's certain kinks I have taken note of that leave I either utterly confused or cross as not my ideal taste. I bein' one who absolutely loves horror, I really don't consider FNaF a horror game at all. As stated, it's too "silly" via the gameplay.
As for those who are big fans of FNaF and make OCs 'n the like, while I don't quite understand what they see in the game, doesn't give I the right to justify their preferences. Want to make an OC? Go for it! I'm not nor will I ever be the one who stops ye. Even if ye may interact with I in the game, I'll respond like I always do. As long as every floof's havin' fun.
Methinks the only thing that gets me with FNaF OCs is when individuals genderbend the characters or skip around sayin' they're Foxy's daughter or Freddy's son, etc. or even the characters themselves then try to make 'em act just like/very similar to the original characters when they're not yet familiarized with how to properly reenact the animatron's personality. Thus, they end up lookin' to I like plushies rollin' around instead of what the game originally intended 'em to be. In-character wise, I speak of course.