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I can't get this idea of the Marauders x Spider-Man out of my head, so I started writing a bit about the background of each of the Marauders in this AU.
So in this AU, Hogwarts is like Brooklyn Visions Academy, the only difference being that it's located in London and the students are still divided into houses, but it's more like which dormitory sector you belong to and, ultimately, they're not taken as seriously as in canon.
Peter: He's an only child, his father is a paramedic and his mother is a nurse. Due to his parents' shifts, he's somewhat used to taking care of himself. He attends Hogwarts on a scholarship, although he always struggles to maintain good grades and not lose the scholarship. He suffers quite a bit when it comes to balancing his grades and his life as Spider-Man. He's quite close to his parents and his father's death really affected him a lot. After this, he became quite close to Professor Sprout and Professor Flitwick, often turning to them for advice. He's a bit afraid of Professor McGonagall.
James: Like Peter, he's an only child and his parents are quite old. Because of that, he's quite spoiled, but he adores his parents, and woe to the person who insults either of them because James Potter isn't afraid to hit someone. He's the captain of the Hogwarts hockey team. His family is extremely wealthy, so he's always attended private schools and has no problem spending money on gifts for his friends. He's Professor McGonagall's favorite, as he's the best student in his class and has ensured that Hogwarts hasn't lost a match in the last two years.
Remus: Like the other two, he's an only child. I didn't want to completely ignore Remus's lycanthropy, so I decided to make him a mutant. He can control the transformation, but it's quite difficult for him to do so during full moon nights, so he simply opts to spend them as a wolf. He still has scars, but they're from when he was attacked by Fenrir Greyback (who is also a mutant in this AU). Remus managed to defend himself, and that's when he discovered he was a mutant. Lyall Lupin has made a great effort to change his beliefs about mutants since discovering his son was one. Now he and Remus are quite close. Likewise, Remus couldn't ask for a better mother than Hope Lupin. Like Peter, he has a scholarship, and thanks to it, his family can afford to send him to a school like Hogwarts, as Lyall Lupin is a police officer and Hope Lupin works in a bookstore, so they don't have money to spare like James and Sirius.
Sirius: He's a special case. Like in canon, he didn't have a good relationship with his family. For that reason, he likes attending Hogwarts because it allows him to be away from his family for much of the year. Initially, when he and Regulus started attending Hogwarts, they were quite close, but they started to drift apart over the years. Finally, when he turned 15 (about 6 months after Peter became Spider-Man), he ran away from home and lived with the Potters for a while until his uncle Alphard Black managed to become his legal guardian. Sirius goes to therapy once a week, but he's managing quite well. Alphard is also trying to get custody of Regulus, but it's not easy, as the Black family is quite wealthy and probably has the best lawyers in England.
I've been browsing AO3 for hours and stumbled upon a few AUs where a character becomes Spider-Man. I quite enjoy these types of AUs because of the endless story possibilities, considering Spider-Man has a vast array of villains. The best ones I found were where Remus and James were Spider-Man. But I'm here to pitch an even stranger idea: what if Peter Pettigrew were Spider-Man? I mean, the guy is a coward, and I think that would make for a great story opportunity – someone as cowardly as Peter becoming Spider-Man, someone who clearly lacks a moral compass at first. And here's where I think Peter would urgently need the death of someone as significant to him as Uncle Ben was to Peter Parker. It couldn't be any of the Marauders because Peter holds them in a strange kind of pedestal, so the death of any of them might scare him more than give him the push he needs to do good.
So, hypothetically, a character not mentioned in canon could be used: Peter Pettigrew's father. Now, listen, Peter definitely wouldn't use his powers for good at first. I'd bet Peter would use them to steal some small things from stores – these kinds of things would give him some self-confidence, which we know Peter definitely lacked. So Peter's father discovers this, and he and Peter argue. Peter runs away from home, and his father goes after him (similar to what happens in Andrew Garfield's movie). Peter's father encounters the thief Peter just let go and is shot dead. Peter wants revenge because now he has these powers, and that's what he always wanted – now he's more powerful than anyone, and he wants to find the man who took his father from him.
I think his origin as Spider-Man would definitely be much more violent since it would be for entirely selfish reasons, but I also like to think that with the help of the Marauders, they could help him take a better path, especially James. I think he could definitely have a great influence on Peter's morality.
I also like to think that Peter would still be the same shy and kind boy but definitely much less willing to take any kind of mockery, especially after what happened to his father. As Spider-Man, he would be much more himself, as if wearing the mask eliminates that little fear of what others might say.
Lastly, I don't think Peter would be smart enough to create web shooters, so I actually think if I ever write this, I'd give him natural webs like Tobey McGuire's Spider-Man.
The opinions don't matter to me, but please, if you're going to spread hate about Peter Pettigrew, just don't comment. This is an AU, so we're completely taking into account the canonical personality of the character.
Peter Pettigrew is 9 years old and James Potter are best friends.
Peter Pettigrew is 12 years old and James Potter is his best friend.
Peter Pettigrew is 15 years old and James Potter and Sirius Black are best friends.
Peter Pettigrew is 18 years old and due to a stupid infatuation, he has made the biggest mistake of his life.
Peter Pettigrew is 21 years old and because of him, his best friend is dead.
Peter Pettigrew is 24 years old and manages a cafeteria while learning how to take care of a 4-year-old child.