One popular trope is the 'Civilian Identity Reveal'. It's always exciting to see how other characters react when they find out Peter is Spider - Man. Another is the 'Peter Gets a Mentor' trope, which could be someone like Tony Stark or an original character. And of course, the 'Peter Saves the Day Against All Odds' is a classic.
One common trope is the 'fish - out - of - water' situation. When Peter is deaged, he's in a body that doesn't match his mind. So he has to navigate the world in a new way, like trying to go to school as a child again when he has the knowledge of an older person. Another trope is the 'protective Avengers'. They see this deaged Peter and immediately feel the need to protect him, which leads to some really sweet moments.
Another trope is 'Mutual Discovery'. In these stories, Peter and Lorna discover new things about their powers or their pasts while interacting with each other. This trope helps to build a deeper connection between them as they share these revelations and grow together as characters.
The 'fish out of water' trope is quite popular. For example, Peter Parker visiting Star City and being amazed by how Oliver Queen operates as the Green Arrow in a different environment compared to his New York. It creates a lot of humorous and interesting situations.
One popular trope is the 'Secret Identity' angle. Writers often play with the idea of Peter Parker trying to keep his identity as Spider - Man a secret while also dealing with his relationships, which adds a lot of drama and tension. And of course, his handsomeness can be a factor in attracting love interests or causing jealousy among characters.
Time - travel and alternate universe tropes are quite popular too. Writers might send Peter Parker or Pietro Maximoff to different timelines or universes, which can lead to all sorts of interesting scenarios. It could be a chance for them to meet different versions of themselves or other Avengers, and these stories often involve a lot of action, adventure, and self - discovery.
The 'hurt/comfort' trope is also quite common. Wade might get into some dangerous situations, and Peter uses his powers to save him or vice versa, which then leads to a deeper emotional connection. There are also fics that play with the 'fish out of water' trope, especially if Wade is introduced into Peter's more normal life in Queens, and his chaotic nature disrupts Peter's routine in an interesting way.
One popular trope is the 'What - If' scenario. For example, what if Wendy had decided to stay in Neverland permanently? Fanfiction writers often explore this idea, imagining how her life would be different and how it would affect the other characters. Another common trope is the 'Power - Up' where a character, like Wendy, might gain new powers or abilities during her time in Neverland. This can lead to new and exciting adventures.
One common trope is the over - protective Peter. He's always worried about his sister getting involved in his dangerous superhero life. For example, in many fics, he'll try to keep her away from any situation that might put her in harm's way.
One popular trope is the 'Redemption Arc' for Mysterio. In many fanfictions, he is given a chance to redeem himself in Peter's eyes. Another is the 'Mentor - Apprentice' relationship, where Mysterio teaches Peter some new skills or ways of thinking. 'The Enemy - Turned - Ally' trope is also common. They start as foes but circumstances force them to work together.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of Peter Parker fanfictions. Just use the search function and type in 'Peter Parker' and then browse through the results. Another option is FanFiction.net. Many talented writers post their works there as well.