Archive of Our Own (AO3) is a great place. It has a large collection of fanfiction, including for Ultimate Spider - Man. There are various stories with different themes and writing styles.
Look for stories with high ratings and lots of reviews on platforms like AO3 or FanFiction.net. Usually, if a lot of readers like it, it's a sign of good quality.
Even one of Spider - Man's fellow superhero friends might betray him. Maybe they get jealous of Spider - Man's popularity or feel that he is getting all the credit for their team's successes. This internal betrayal would add a lot of drama and conflict to the fanfiction story.
One possible fanfiction could be about Peter Parker using his Spider - Man abilities in a snow - covered city during a cold snap. Maybe he has to deal with villains who are taking advantage of the difficult weather conditions. For example, a villain could be using the snow and ice to create dangerous traps for the citizens, and Spider - Man has to swing through the icy streets to stop them.
Peter Parker as Spider - Man is obviously a popular character. He's the main protagonist. Venom is often a popular character in fanfictions as well. His dark and menacing nature contrasts with Spider - Man's heroic side. Mary Jane might also be popular as she is an important part of Spider - Man's story. Another could be Harry Osborn, as his relationship with Peter is always an interesting aspect to explore in fanfictions.
Deadpool in fanfiction with Ultimate Spider - Man can be a source of comedic relief. His fourth - wall - breaking and over - the - top personality contrast with Spider - Man's more serious and relatable nature. This can lead to some really interesting interactions. For instance, Deadpool might make jokes about Spider - Man's costume or his love life, while Spider - Man tries to stay focused on the task at hand, like stopping a villain. Their relationship can range from reluctant allies to begrudging friends, depending on how the author writes it.
It's not strange at all. Fanfiction is a form of fan expression, and as the subject of these stories, Spiderman would have a unique perspective. He might be interested in the different interpretations of his powers, relationships, and adventures. It could also be a way for him to understand the hopes and dreams that fans have for his character. Plus, it could be a fun pastime for him, something different from his usual crime - fighting routine.