One idea could be that Spider - Man travels back in time to the moment when Uncle Ben was killed. He tries to prevent it, but realizes that changing this event would have unforeseen and disastrous consequences for the future. So, he has to watch it happen again, but this time he gains a new perspective on his powers and responsibilities.
Perhaps Spider - Man time travels to the early days of the Avengers. He gets to meet the founding members in their prime and has to team up with them to stop a threat that was previously unknown. This could involve him learning new skills from the likes of Captain America and Iron Man, and also having to prove himself to these heroes. He might even accidentally influence some events that later shape the MCU as we know it.
Well, perhaps Spider - Man time - travels to the time when the first radioactive spider bit him. He tries to stop it from happening, but realizes that this would mean he would never become Spider - Man. So he has to make a choice between changing his own origin and living with the consequences of his actions. And also, he could time - travel to different dimensions in the past and meet alternate versions of himself, which would lead to some really cool fight scenes and self - discovery moments.
One idea could be that the reader is a scientist who accidentally discovers a new element that is crucial for Spider - Man's suit. So Spider - Man has to team up with the reader to protect this discovery from villains. Another plot could be the reader being a new neighbor of Peter Parker. They start off as friends, but as the reader gets into trouble, Spider - Man has to save them, and gradually they develop deeper feelings for each other.
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 that Black Widow has to train Spider - Man in some covert skills. Since she has a lot of experience in espionage and combat, she could teach him how to be more stealthy. For example, she could show him how to move quietly in the shadows during a mission.
If Spider - Man travels back in time, it could strengthen his relationship with Uncle Ben. He might get a chance to really talk to him and understand his values better, which would in turn make him a better hero in his own time. Also, his relationships with his friends like Ned and MJ could be affected. For example, if he changes something in the past, he might come back to a different present where their relationships have shifted.
Well, a possible plot for a Spider - Man Homecoming time travel fanfiction could involve Peter traveling to the future. He sees a desolate New York City, which has been taken over by a powerful new villain. He then has to find a way to bring this knowledge back to his own time and prevent this future from happening. This would involve him using his skills and intelligence to figure out how to change the course of events.
Another fanfiction concept could be a mentorship situation. Spider - Man looks up to Captain Marvel as a powerful and experienced hero. She could train him to better control his powers and also teach him how to handle the pressure of being a hero on a larger scale. This could involve some intense training sessions where Spider - Man has to push his limits, and Captain Marvel shares stories from her own experiences in the galaxy.
One idea could be exploring the different Spider - People's home universes in more detail. For example, showing what Miles Morales' daily life in his universe was like before becoming Spider - Man. Another could be a team - up between Miles and an older, more experienced Spider - Person from a different universe to face a new and powerful villain.
Perhaps there's a fanfiction where Spider Man and Spider Gwen accidentally swap powers. They have to learn how to use each other's abilities to fight crime. This would lead to some really funny and also challenging situations as they get used to different ways of web - slinging and sensing danger.
One interesting fanfiction could be about Spider - Man and Venom teaming up to fight a new, powerful villain that neither could defeat alone. Maybe a symbiote - enhanced Green Goblin. In this story, they would have to put aside their differences and learn to work together, with Spider - Man using his agility and Venom's brute strength.