Maybe Thor. Peter has never seen someone as powerful as Thor with his hammer and god - like abilities. Thor's larger - than - life presence could be really fascinating for Peter.
One possible plot could be that Peter Parker, while on a school trip or some scientific research in space (maybe with Stark tech), accidentally stumbles upon Peter Quill and the Guardians of the Galaxy. They initially have a bit of a misunderstanding as their ways of doing things are quite different. Parker is used to the more down - to - earth (literally) problems in New York, while Quill is dealing with intergalactic threats. But they soon realize they can learn from each other. Parker could teach Quill about the latest Earth - based technology, and Quill could show Parker the wonders of the galaxy.
A really unique concept is when Peter's consciousness gets split among different dimensions. So he has to find a way to reunite his consciousness while also dealing with the different situations in each dimension. For example, in one dimension he might be a wanted criminal, while in another he's a hero worshiped by all. This creates a lot of internal conflict for Peter as he tries to piece himself back together.
One great fanfiction in this category could be 'The Convergence of Universes'. It explores how MCU characters interact with Earth - 616 Peter Parker in a really exciting way. The story has some great action scenes where Peter shows off his skills from Earth - 616 while also learning from the MCU counterparts.
One great Peter Parker dimension travel fanfiction is 'Across the Dimensions'. It shows Peter exploring different dimensions and meeting alternate versions of himself. The story has great action scenes and really delves into how Peter adapts to these new and strange worlds.
Obviously, Peter Parker is one of the main characters. He's the friendly neighborhood Spider - Man. And then there are the Defenders. This group usually includes Daredevil, Jessica Jones, Luke Cage, and Iron Fist. So all of these characters would be the main ones in this fanfiction.
Perhaps in this fanfiction, Peter Parker meets the Defenders when they are all investigating the same strange occurrences in the city. There could be a mystery involving some sort of strange energy or new type of criminal organization. The Defenders with their unique skills and Peter with his spider - powers would start to piece together the clues. Along the way, they would have to overcome their differences in approach. For example, Peter is used to working alone most of the time, while the Defenders are a team. But in the end, they would combine their forces to solve the mystery and protect the city.
Well, in such a fanfiction, Peter Parker might use his superhero abilities to protect the president from some sort of threat. Maybe a supervillain is targeting the president, and Peter swings in to save the day.
In this fanfiction, Peter Parker might show off his amazing spider - abilities to the Avengers. Maybe he'll swing around the Avengers Tower impressing everyone.
Peter Parker is a science - minded individual, always looking for ways to use his intellect to solve problems. Peter Quill, while not lacking in intelligence, is more about gut instincts and his ability to improvise in dangerous situations. This difference could cause some friction at first. But when it comes to protecting others, their personalities would mesh. Parker's selfless nature to protect the people of New York and Quill's determination to keep his crew and the galaxy safe would bring them together. They could learn from each other's approaches to handling difficult situations.