Well, a cool plot might involve Thor losing his powers and Spider - Man having to teach him how to fight without them. They could end up in a situation where they are in a strange dimension full of robotic enemies. Spider - Man's web - slinging skills and Thor's combat experience without powers would be put to the test as they try to find a way out.
Perhaps a plot where an ancient evil entity is awakened that can only be defeated by a combination of Spider - Man's scientific knowledge and Thor's magic. Spider - Man discovers some weaknesses of the entity through his research, and Thor uses his connection to the otherworldly forces to implement the plan. Along the way, they learn to respect each other's very different abilities and outlooks.
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 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.
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.
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.
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 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 possible plot idea could be a team - up between the Young Justice characters and Spider - Man. They could face a common enemy that is too powerful for either group alone. For example, a super - villain who has the ability to manipulate time and space, causing chaos in both their universes.
Perhaps Spider - Man gets stuck in a time loop. Every time he tries to fix something in the past, it just makes the situation worse in the future. He has to find a way to break the loop while also dealing with his enemies who are taking advantage of the chaos. This would add a lot of suspense and action to the fanfiction.
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.