Well, perhaps in the 'Spiderman Turned into Girl Fanfic', the story could revolve around her trying to hide this transformation from her loved ones at first. She may struggle with her identity, feeling like she's lost a part of who she was as Spiderman. But then, as she embraces her new form, she starts to use it to her advantage in fighting crime in ways that the male Spiderman couldn't. For example, she could use her new - maybe more graceful - physique to move more stealthily through the city.
One possible storyline could be that as Spiderman turns into a girl, he - or rather she - has to deal with the sudden change in how society views her. She might face different challenges in her superhero duties, like people not taking her as seriously at first. Another could be that she discovers new powers or abilities that are unique to her female form.
Another storyline might involve Harry having to hide his condition from Voldemort and his Death Eaters, as being in a vulnerable pregnant state makes him an even bigger target. He could also form unexpected alliances with female characters who help him through this difficult time.
One possible storyline could be that she is turned into a card by a powerful villain as a way to imprison her powers. Her friends then embark on a quest to find the magic to turn her back. Another could be that it was an accidental spell by a novice wizard that changed her, and she has to learn to communicate from within the card to get help.
One possible storyline could be that in a battle against a powerful new villain, Spiderman sacrifices himself to save the other Avengers. He might use his web - slinging skills to hold back a deadly explosion or some sort of dark energy blast that was headed towards his teammates. Another could be that he is poisoned by a new kind of toxin created by an evil scientist working for a bigger bad guy in the Avengers' universe. As he slowly succumbs to the poison, he has some touching moments with the other Avengers, like giving Tony Stark a piece of advice on how to be a better hero, and finally passes away.
The Green Goblin could still be the main villain. He might see the transformed Spiderman as an easier target now that she's a girl, or he could be even more enraged by the change and be more determined to defeat her.
One possible storyline could be that Spiderman and Batgirl team up to fight a common enemy. Maybe a new super - villain has emerged in Gotham that has some connection to New York, so they join forces. Their different skills, like Spiderman's web - slinging and Batgirl's martial arts, would make for an interesting dynamic in combat.
Maybe in the fanfiction, Lucina discovers a way to travel to Spiderman's New York. There, she is initially confused by the modern world but Spiderman helps her adapt. They team up to stop a new villain who is causing chaos in both their worlds. The story could explore how their different skills and personalities complement each other.
A third storyline could involve a scientific experiment gone wrong that somehow links Elsa's magic and Spiderman's powers. This causes them to be able to share each other's abilities temporarily. They have to learn to control these new combined powers while also facing a villain who wants to use this power - linking phenomenon for his own evil purposes.
One possible storyline could be that Spiderman, while on a mission in a strange dimension, encounters Morrigan. They initially clash due to their different natures. Spiderman is used to protecting the innocent in his city, while Morrigan has her own motives in her world. But as they face a common enemy in this new dimension, they start to work together. Spiderman teaches Morrigan about the value of selfless heroism, and Morrigan shows Spiderman some unique combat techniques from her realm.
One reason could be to add diversity. In the world of fanfiction, people like to explore different identities for well - known characters. By making Spiderman a girl, it can attract a wider range of readers, especially female readers who might be able to relate more to a female version of the hero.
Perhaps there is a powerful artifact that both Spiderman and the Avengers are after. They end up in a conflict over it. Spiderman, with his street - smart ways, tries to outwit the Avengers and get the artifact for himself, believing he can use it for good in his own way.