This isn't a theory. These are head canons for the MCI, me filling in info we don't get from them.
General:
Since we get told that they hate adults but not kids, here's my idea. Now see, I know we get told that they think the nightguard is William, which makes sense, but even though they're kids, I don't think they're dumb enough to think that every adult that visits Freddy's is William. Plus phone guy says they just "stare" at them. Personally, I wanna believe that in their short lives, they didn't have a good experience with adults. Which will be noted here.
Also I headcanon that in the movie universe, the Marionette gave the kids their item things, (hat, ears, bib, hook) the only thing that ruins this theory is the fact that the Golden Freddy kid didn't get anything lmao.
Gabriel/Jeremy:
My headcanon for Gabriel is that he had a single parent. For this, let's go with a father. I imagine he visits Freddy's a lot while his dad is out working, and when his dad is around, he neglects him and doesn't care for him. After Gabriel went missing, I think his dad might've started regretting not spending enough time with him. I also think Gabriel is 7 because of the movie casting, and because Help Wanted confirms it. It is commonly agreed that Gabriel and Jeremy knew each other before, since Freddy and Bonnie are always paired together throughout FNAF. I agree with this, especially since it's said two kids went missing at the same time. Some people think they may be brothers, but I don't think so because in the books, the kids who possess Freddy and Bonnie are different races and Jeremy isn't even there, and in the movie, they're also different races. So, I'm gonna go with "brother from another mother" (but not literally), they were friends. I imagine Jeremy also has a single parent, let's go with a mother, she leaves Jeremy at Freddy's all the time, where he hangs out with Gabriel. I know the movie is a different timeline, but I still use it for my headcanons. In this case, I think Jeremy may be around 10-12. Now, why would a 10-12 year old be friends with a 7 year old? Well it's not THAT weird. Maybe Jeremy didn't have friends his age, so he hung out with the neighbor kid and took care of him like he was his brother. In fact, maybe they CAN be brothers. Step-brothers. Point is, they were close. I won't be talking about how they were all lured away, there is separate theories for those, later. As for their personalities, I imagine Gabriel is a cheery energetic kid, while Jeremy is a little shy and more serious. Gabriel is alone in Help Wanted, so maybe Jeremy lost him and when he tried looking for him, Springbonnie "showed him" where he was.
Susie:
For Susie, her life SEEMS perfect. She has two parents, her family is wealthy, and she has a pet puppy. But here's my headcanon here, the way Susie is dressed, it seems like she's dressed very nicely, and her hair is curled too. Why would a girl who dresses like this be at Freddy's? In the novels, the other 4 kids dress like everyday kids, Susie is the only one who looks sort of elegant. My headcanon is that she had a sibling, who also had a dog, this sibling would be around 18 or so, because she's old enough to make her own decisions. I think her parents won't allow animals because they think that they're nasty. But the older sibling got one once they moved out, but....tragedy struck. And after said tragedy, Susie got to keep the dog. Her parents didn't approve of the dog, so they let it go one day, but Susie tried finding it. She ended up at Freddy's, and was amazed of everything, which is why she started playing Fruity Maze as her dog was missing. Susie's personality, I think she is sweet and kind, she obeys her parents even when she doesn't agree with them, out of fear she'll get in trouble. But secretly, she's always hoped to run free and make her own decisions, maybe ride bikes, play video games, etc. but her parents never allowed it.
UPADTE AFTER READING COMING HOME:
Soooo apparently Susie has a story in Fazbear Frights in Coming Home. Technically, it's a different continuity since Susie says her dad left, yet he's there in into the pit looking for her, AND they never mention Susie's dog. But I can still probably make some stuff. So first, it seems I was right, Susie does in fact have a sister...except she's YOUNGER than her, not older. It also seems like Susie's family in fact isn't rich since they live in a small house in a seemingly lonely area. Her mom's name is Patricia, and her dad's name is Hayden. So here's how I can change my headcanon to apply to real "canon:"
YOU ARE READING
FNAF Theories
HorrorNot everything is a theory. I also share my head-canons. You don't have to agree with everything lol