Well, if Peter Parker survived the snap in fanfiction, he'd probably be dealing with a great deal of survivor's guilt. He might struggle to come to terms with the fact that so many of his friends and loved ones vanished. He could then use this guilt as motivation to search for a way to reverse the snap, leading him on a whole new adventure.
His character could become more independent. Without some of his usual allies, he'd have to rely on himself more. He might develop new skills and strategies for fighting crime.
He might use his spider - powers to outperform in Quidditch. His agility could make him an excellent seeker, zipping through the air to catch the golden snitch much faster than others.
He would gain the power of Thor. Since Mjolnir is a powerful weapon, Peter would be able to control lightning and have enhanced strength. He could use these new powers to fight against stronger villains in the fanfic world. Maybe he would team up with Thor and other Avengers in a more powerful way.
If Peter Parker lives with the Avengers in fanfiction, it could be really exciting. He might get into some friendly rivalries with the other members. For example, he and Thor could have a competition about who's stronger in a fun, non - serious way. Also, Natasha could train him in espionage and stealth, which would be super useful for his crime - fighting in New York. And he could also help the Avengers understand the street - level threats better, since he has more experience with that kind of stuff.
In a 'Loki adopts Peter Parker' fanfiction, Loki might teach Peter some of his trickster ways. Maybe he'd show Peter how to deceive enemies in a more magical way than just using his Spidey - sense. For example, Loki could teach Peter how to create illusions to confuse villains during a fight.
Well, it could go in many directions. One possibility is that Shield initially captures Peter Parker because they misinterpret his actions as being against the greater good. However, as they start to understand him better, they realize their mistake and team up with him. Or, it could be that Peter has some information that Shield wants, and they're willing to go to extreme lengths to get it from him.
As the CEO, Peter would probably use his connections in the superhero world to Stark Industries' advantage. He could form a sort of superhero - tech alliance. For instance, he could get Iron Man's old friends and allies to work with him on new projects. He might also use his knowledge of the criminal underworld, from his days fighting crime, to protect the company's secrets and technology from falling into the wrong hands.
Well, if Peter Parker uses the Infinity Stones in fanfiction, it really depends on how the writer envisions it. He could accidentally cause chaos. For example, the power of the stones might be too much for him to control at first. But on the other hand, he could use them to enhance his spider - abilities to a whole new level, like being able to travel through different dimensions instantly.
Well, he might start to lose his powers. The poison could be something that messes with his enhanced physiology that gives him his Spidey - abilities.
In this fanfiction, Peter Parker doing the snap could be a very different scenario compared to what we saw in the movies. He could be tricked into doing it by a villain who wants to cause chaos. Once he snaps, it might not have the expected results. Instead of simply eradicating half of the life in the universe, it could create some sort of rift or imbalance. Peter then has to find a way to fix this new problem, all while dealing with the guilt of what he has done.