Well, in a Miles x Gwen Spider - Verse fanfic, it could be about their origin stories in this particular universe. It could show how they discovered their powers and how they came to be the heroes we know. There could be a lot of action scenes where they use their unique spider - abilities in creative ways. For example, Miles could use his invisibility and venom strike while Gwen uses her acrobatic skills and web - swinging in a more graceful manner. Their friendship or potential romance could also be a central part of the story, with them learning to trust each other more as they face various challenges.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - created works, and you're likely to find many Miles x Gwen 'Spider - Verse' fanfictions there.
There might be a fanfiction where Miles and Gwen go on a journey across different dimensions in the Spider - Verse to find a cure for a strange spider - related disease that's affecting all the spider - people. It could explore their relationship as they rely on each other during this difficult quest. In this story, they could face various challenges and meet different versions of themselves and other spider - characters from different universes.
In many aspects, 'Across the Spider-Verse' adheres to the comic book canon. However, there might be some creative liberties taken to make the story more cinematic and engaging for the audience while still respecting the core elements of the comics.
In the movie, Gwen's story is quite interesting. She comes from her own dimension where she has to face various threats. She has a unique look with her white - and - pink costume. Gwen's relationship with Miles is complex. She serves as a sort of mentor and friend to him. She's been through a lot in her world, including the loss of someone close, which has shaped her into the tough and determined Spider - Woman we see in the movie. Her character adds depth to the overall story as she brings her own perspective and experiences from her dimension into the multiverse - spanning adventure.