The symbiote could be a creation of Oscorp in the Spider - Man Homecoming setting. Maybe it was an attempt to create a super - soldier like serum but went horribly wrong. The symbiote starts to bond with various people in the city, causing them to act out in strange and dangerous ways. Spider - Man has to track down the source of the symbiote and find a way to reverse its effects. He might also have to deal with the media attention and public fear that comes with this new threat in the city.
A great plot idea could be that the symbiote actually has a mind of its own and it's trying to find a way back to its home planet. It uses Spider - Man as a host to build a device to communicate with its home. Meanwhile, Spider - Man is struggling to keep his identity and life in order while dealing with the symbiote's demands. Also, the symbiote could infect other people in the city, creating a group of symbiote - controlled minions that Spider - Man has to fight. This would add a whole new level of danger to the story.
One idea could be exploring Peter Parker's struggle to balance his normal high school life with his increased responsibilities as Spider - Man. Maybe he starts to get distracted in class more often because he's up all night patrolling the city.
One idea could be Spider - Man joining the Avengers on a mission to a far - off planet. He uses his agility and quick thinking to help the team out of tricky situations. Another could be a story where Spider - Man has to prove himself to the Avengers in a training exercise set up by Iron Man.
One idea could be an OC who is a new student at Peter's school and has a hidden power related to technology. They end up helping Spider - Man with a villain who is hacking into all the city's tech systems.
A plot idea could involve the symbiote suit being able to communicate with other symbiotes from outer space. It could be luring them to Earth, thinking they can all live in harmony, but they actually want to take over the planet. Spider - Man has to figure out a way to stop this while also dealing with the fact that the suit is becoming more and more unruly as it gets closer to its 'friends'.
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.
The symbiote can make the story darker. Since it has a somewhat malevolent nature, it can bring out more of the edgier side of Spider - Man. For example, Spider - Man might become more aggressive in his fight against villains, which would change the overall feel of his battles.
A great plot idea would be Mary Jane being kidnapped by one of Spider - Man's enemies who wants to use her as bait. Peter has to use all his skills and intelligence to rescue her without revealing his identity to the kidnapper. Also, Mary Jane could start training in self - defense secretly and ends up helping Spider - Man during a fight without him knowing it was her at first.
One interesting plot idea could be Peter trying to balance his high school life with new, more dangerous threats in Queens that are not related to the big - name villains. Maybe a group of tech - savvy thieves are using stolen Stark tech in creative ways, and Peter has to outwit them without revealing his identity to his classmates. Another idea is exploring Peter's relationship with his teachers in a more in - depth way. For example, a teacher suspects that Peter is up to something unusual and starts to investigate, putting Peter in a tricky situation.
One idea is that Harry Osborn, jealous of Peter's popularity and heroics, decides to create his own alter - ego to compete with Spider - Man. But as he delves deeper into this new identity, he realizes that the world of superheroes is much more dangerous and complex than he thought, and he has to decide whether to continue or give it up.
One idea could be that the Agents of Shield discover Peter Parker's identity as Spider - Man early on. They could then offer him some special training or equipment. For example, they might give him a high - tech suit upgrade that has features similar to the ones in the Agents of Shield technology. This would add a new dimension to his crime - fighting in Spider - Man Homecoming.