The Gang: A Five Nights at Freddy's Fanfic

Anybody who has been playing 5 Nights at Freddy's for a while knows about how a kid-friendly spinoff of Chuck-E Cheese's became the horror it is today; a man dressed up as one of the animatronics lured four children into a room and stuffed each one into an animatronic suit, killing them. They now wander Freddy Fazbear's Pizza from midnight to 6am, looking for the security guard to kill him.
But the thing is, these were just kids that died. Maybe one of them was a teenager in their freshman year of high school, a prodigy that loved to box at a gym. What if he was real?
What was his story, I wonder? How did they get to be singled out in a pizza place for kids, lining up in a room for murder in 1987?
What if what you've heard about them- what if there's more to it?
You're about to find out.