One common theme is the exploration of their relationship in different universes. Since they are from the Spider - Verse, fanfics often play with the idea of how their relationship could develop in various alternate realities.
Fanfiction.net is also a classic option. It has been around for a long time and has a huge database of fan - created stories. Check their Marvel or Spider - Man sections and specifically look for stories that involve Spider - Gwen and Miles Morales.
One great fanfiction is 'Parallel Hearts' where Miles and Gwen team up to face a new villain in an alternate dimension. It has great character development and action scenes.
A theme that stands out is the exploration of different dimensions. Given the multiverse aspect in their stories, fanfics often take them to different dimensions where they face new challenges and meet different versions of themselves or other characters. This adds an element of mystery and excitement to the stories.
Their relationship can be developed through shared experiences. For example, when they face a tough villain together, they start to understand each other's fighting styles and strategies better. This mutual respect can lead to a deeper bond. Also, having them save each other's lives can strengthen their connection. Like when Miles Morales is in a dangerous situation and Spider Gwen swoops in to rescue him, it shows how much they care about each other's well - being.
One idea could be that Spider Gwen and Miles Morales have to team up to stop a new villain who has the ability to manipulate time. This would put their relationship to the test as they struggle to work together while also dealing with the chaos of the altered timelines. Another plot could involve them traveling to an alternate dimension where their roles are reversed, and they have to learn to adapt to each other's usual situations. A third idea is that they discover a long - lost relative who has superpowers and they must decide whether to trust this new person or suspect them of having ulterior motives.
One idea could be that Miles and Gwen team up to stop a new villain who can manipulate time. They have to race against the clock to figure out the villain's weakness before the city is frozen in a time loop. Another could be that they discover a parallel dimension where they are the only superheroes left and have to find a way to restore their respective universes.
One common theme is the exploration of their relationship. Since they are both Spider - People, they have a lot in common. Fanfics often look at how they balance their superhero lives with their feelings for each other.
In my opinion, Kingpin would be a crucial character to include. He could be the mastermind behind a new threat that Miles and Gwen have to face. His power and influence in the criminal underworld would make for a great source of conflict. Then there's also Silk. She has her own set of powers and a connection to the Spider - Verse. Her presence could add more depth to the relationships between the characters and bring in some new plot elements related to the Spider - powers and their origins.
In Gwen Stacy and Miles Morales fanfic, the characterizations are really interesting. The writers can take the base personalities of these two characters from the comics or movies and expand on them. They might give Gwen more of a rebellious streak when she's with Miles or show Miles as being more vulnerable around Gwen.