One reason could be to create a new and exciting dynamic. It adds a different layer to Peter's character and backstory.
Maybe it's about combining two popular characters in an unexpected way. Writers might think it would lead to interesting story arcs, like how Peter would grow up with a powerful mom like Captain Marvel. It also could be a way to explore the idea of a superhero family in a different light, since Captain Marvel's powers are so different from Peter's. It gives a chance to see how their powers and personalities would interact within a family setting in a fanfic world.
Some fanfic writers might do it to bring a fresh perspective to both characters. By making Captain Marvel Peter's mom, they can play with the idea of inheritance of powers in a new way. For example, Peter could potentially inherit some of Captain Marvel's more cosmic - related powers. It also allows for a re - imagining of Peter's support system and how it would be different having a mom who is a major force in the universe. It gives room for exploring new emotional and story - based territory that isn't covered in the official Marvel stories.
In some fanfics, there could be a creative interpretation where Captain Marvel is made out to be Peter's mom, but this is not part of the official Marvel canon.
It might include a rewritten backstory for Peter, showing how he grew up with Captain Marvel as his mom. There could be scenes of her teaching him about his powers or about the universe. Also, it may have new interactions between Peter and other characters in the Marvel universe, as they would view him differently with Captain Marvel as his mother.
I'm not sure if there is an existing 'Captain Marvel is Peter's mom' fanfic. Fanfics can cover a wide range of wild and creative ideas, but this one seems rather unorthodox. There could potentially be some out there written by creative fans who like to explore unique relationships in the Marvel universe, but without actively searching fanfic platforms, it's hard to say for sure.
In most official Marvel lore, Captain Marvel has no relation to Peter Parker in that way. However, in fanfic, the writer can create any kind of relationship they want. So it's possible in fan - created stories for Captain Marvel to be depicted as Peter Parker's mother, but it goes against the traditional canon.
One way could be through some sort of time - travel or alternate reality plot. For example, if there was a situation where Captain Marvel went back in time and became involved with Peter Parker's father, or if an alternate reality had different rules of genetics and relationships. Another way could be a magical or alien - influenced situation where Captain Marvel was somehow magically linked to Peter Parker's creation in the fanfic world.
The raid might also change Peter's perception of the superhero world. He's used to his own little corner of it as Spider - Man. But when Captain Marvel comes in, she represents a whole different level of power and responsibility. This could inspire Peter to think more globally about his hero duties and perhaps even consider joining forces with other heroes on a more regular basis.
Well, it could be a really exciting scenario. Captain Marvel is extremely powerful, so if she 'raids' Peter's fanfic world, she might disrupt the story in a big way. Maybe she accidentally changes the plot or gets into a misunderstanding with Peter. For example, she could think Peter is involved in something dangerous when he's just dealing with normal Spider - Man stuff in the fanfic.
One possible plot could be that Captain Marvel discovers Peter, who is perhaps an orphan or in a difficult situation. She decides to take him under her wing. She could teach him about the vastness of the universe, and how to control his powers better if he has any. Peter might learn valuable lessons about heroism and responsibility from her, and they could go on adventures together, facing off against powerful intergalactic threats.
One possible reason could be a sense of failure. Maybe in the fanfic, Captain Marvel fails to protect someone important in the Young Justice universe, like a young hero in training. This could lead to feelings of guilt and ultimately make him cry.
Fanfic writers often draw inspiration from the relationships between characters. Captain Marvel doesn't have as many pre - established and well - loved relationships within the superhero universe as some other characters. For example, the bromance between Thor and Hulk or the complex relationship between Batman and Joker in DC. Without these kinds of engaging relationships to build on, it might be less appealing for writers to include her in their fanfics.