A plot could involve the Spider - Man team getting stranded in an alternate dimension. They would have to find a way to get back home while also dealing with the unique challenges and threats of that dimension. This could include new villains, different versions of themselves, and strange new powers.
One interesting plot idea could be Spider - Man teaming up with unexpected heroes from other universes. For example, he might work with a magical hero to fight a villain who has the ability to manipulate time. This would create a really cool dynamic as they combine their different skills and powers.
Another plot idea is a time - travel story. Spider - Man gets sent back in time to when his uncle was still alive. He has to make sure that his actions in the past don't accidentally change the future too much while also trying to learn some valuable lessons from his younger self and his uncle. This could lead to some really emotional moments and also some interesting battles as he might face off against villains that were active during that time in a different way than he did in his own time.
One idea could be a gender - bended Spider - Man facing different social expectations. For example, in the regular story, Peter Parker has his own set of challenges as a male superhero, but a female version might have to deal with things like being underestimated in a male - dominated superhero world. She could also have different relationships with the other characters. Maybe her friendship with Harry Osborn or her interactions with Aunt May would be more nuanced due to her being female.
One idea could be a crossover with the X - Men. Spider - Man could find himself in the middle of a conflict between mutants and anti - mutant forces. He'd have to use his quick thinking and agility to help the X - Men protect the young mutants. Another could be a crossover with the Fantastic Four. Maybe Spider - Man gets caught in one of Reed Richards' experiments gone wrong and they all have to work together to fix it while also dealing with a new super - villain that emerges from the chaos.
One idea could be a team - up where Spider - Man and Thor have to face a common enemy that can manipulate time. Spider - Man uses his agility and quick thinking, while Thor wields his hammer and godly powers. Another could be a story where Spider - Man accidentally gets sent to Asgard and Thor has to help him get back home while also dealing with the chaos Spider - Man causes in Asgard.
One idea could be Spider - Man teaming up with a new, original superhero created just for the fanfic. They could face a villain who has the power to manipulate time, causing chaos in New York. Another could be exploring what would happen if Spider - Man lost his powers temporarily and had to rely on his wits and the help of his friends to stop a crime wave.
Maybe a fanfiction where all the Spider - Men and Women from different spider - verses team up to fight a common enemy that threatens all of their universes. It could be a powerful cosmic entity that is consuming the multiverse, and they have to combine their unique skills and knowledge to stop it. This would allow for a lot of cool interactions between the different characters.
One idea could be Ava and Peter teaming up to face a new super - villain in the city. Maybe this villain has the ability to manipulate time, and Ava's powers along with Peter's Spider - Man skills are needed to stop the chaos. Another plot could be a story where Ava and Peter get transported to an alternate dimension and have to find their way back while dealing with the different versions of their friends and foes there.
One idea could be that the Sinister Six manages to capture Spider - Man and they try to turn him to their side by using a mind - control device. Another could be a backstory exploration of how each member of the Sinister Six joined the group in the fanfiction universe. Maybe a plot where Spider - Man has to team up with an unexpected ally to defeat the Sinister Six when they are at their most powerful.
One idea could be that Spider - Man has to use his unique street - level skills to help the Avengers in a mission where they are facing a villain who can manipulate technology in a city. His agility and quick thinking can give the Avengers an edge in the narrow alleys and on top of skyscrapers.