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 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.
The symbiote often makes Spider - Man more aggressive. He might be quicker to anger and less patient. For example, he could snap at his boss J. Jonah Jameson more often.
There are many interesting aspects in Spider - Man Homecoming fanfiction related to'school watch'. For example, in some fanfictions, the school watch could be a group of students who keep an eye on any strange activities around the school, which might be related to Spider - Man's secret identity or some villains' plans. It could add an extra layer of mystery and drama to the story.
Perhaps in a fanfiction, Venom is actually a creation of one of the villains in Homecoming who wants to use it to defeat Spider - Man. But the symbiote has a mind of its own and instead starts to have an odd connection with Spider - Man, leading to a complex relationship where they have to figure out if they can trust each other.
A fanfiction could explore Karen's origin story in the context of the Spider - Man Homecoming universe. For example, it could be revealed that she was created by Tony Stark as part of a secret project specifically for Peter. The story could detail how she was programmed and what her initial purpose was, and how that purpose evolved as she interacted with Peter.
One aspect of Flash Thompson in Spider - Man: Homecoming fanfiction could be his relationship with the other characters. He may have a complex relationship with Ned Leeds, for instance. They could start off as rivals but then find common ground. And his perception of Spider - Man could change gradually, from envy to admiration, which would add depth to the fanfiction story.
One interesting storyline could be Venom teaming up with Spider - Man in a Homecoming - based setting. Maybe there's a new threat in the city that they both realize they need to face together. For example, a powerful criminal organization that's using advanced technology stolen from Stark Industries. Another could be a Venom - origin story set during the time frame of Homecoming, where the symbiote's arrival on Earth and its connection to Peter Parker's world is explored in a different way than in the official comics or movies.
Spider - Man could develop a new sense of confidence, but also arrogance. The symbiote suit makes him stronger and more powerful, so he might start to think he can handle any situation alone. This could lead to him pushing away his friends and allies, like Mary Jane or Harry Osborn, until he realizes the error of his ways.
In this type of fanfiction, Spider - Man often becomes more complex. At first, he might be excited about the new powers the symbiote gives him. But as he realizes the downsides, like the potential loss of control, he starts to grow in self - awareness. He has to learn to balance his own moral code with the power - hungry nature of the symbiote.