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.
Thor would be a bit more straightforward. He'd probably see the Spider - People as brave warriors. He might be a bit confused at first about the multiverse concept but would quickly accept it. He'd be like 'These small heroes have great courage, much like the warriors of Asgard.' And he might offer to train them if they ever met. He'd also be entertained by the humor in the Spider - Verse, like the interactions between Peter B. Parker and Miles.
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.
One idea could be a story where Miles Morales has to team up with an alternate version of himself from a dimension where he never became Spider - Man. They have to overcome their differences and learn from each other to stop a new villain that is threatening all the spider - verse.
In Spider - Man Into the Spider - Verse story, it begins with Miles Morales. He's a young boy with his own set of insecurities and dreams. When he gains his spider - like abilities, he has to learn to control them quickly. The story takes a wild turn when the multiverse is involved. There are various versions of Spider - Man, each with their own unique styles and personalities. For example, there's a Spider - Man who is a noir - style detective. Kingpin's actions disrupt the balance of the multiverse. Miles, along with the other Spider - People, has to face many challenges, not only in fighting Kingpin but also in understanding and accepting his new role as a Spider - Man. It's a story full of action, humor, and heart - warming moments as Miles grows into his new identity.
The origin stories are crucial as they create the foundation. They show the individuality of each Spider - hero. Since they come from various dimensions, their origin stories make the multiverse concept more real. We see how different circumstances in different worlds lead to the creation of these heroes, which in turn enriches the whole Spider - Verse idea.