One common theme is justice. When Peter is angry, it's often because he sees an injustice. For example, if an innocent person is hurt or if a villain is getting away with a crime.
In these fanfictions, a common theme is Peter's struggle to control his anger. His powers are great, but when he's angry, he can be more dangerous. So there's often a focus on how he manages his rage while still being a hero. Also, the anger can be a catalyst for him to face new challenges and enemies that he might not have otherwise. For instance, if a new criminal organization is causing harm in the city and the police don't take it seriously, Peter's anger at the injustice spurs him into action.
One common theme is redemption. Peter B. Parker often has to face his past mistakes and try to make up for them. For example, in many fanfics, he might have failed in a relationship in the past and is now trying to be a better person for it.
A common theme is the struggle for control. The symbiote has its own will, and Peter often has to fight to keep it in check. For example, in many fanfics, he battles with the symbiote's urge to be more violent.
One common theme is loss. Whether it's the loss of a loved one like Uncle Ben or a close friend, it often leads to Peter breaking down in tears. It's a way to explore his human side and how he deals with grief.
One common theme is self - acceptance. Peter often has to come to terms with his sexual orientation while also dealing with his superhero identity. Another theme is love and relationships, exploring how he forms romantic connections in a world that may not always be accepting.
One common theme could be struggle. Peter Parker having to deal with homelessness would likely face a lot of difficulties, like finding food and shelter while still trying to be Spider - Man. Another theme might be isolation, as he may feel alone in his situation.
A common theme is the clash between Peter's normal life and his superhero life. He has to keep his identity secret from his school friends while also dealing with the high - stakes world of the Avengers. Adaptation is also a theme. Peter has to adapt to the Avengers' way of doing things, which is often very different from his solo operations as Spider - Man. Another theme can be sacrifice, where Peter might have to sacrifice his personal time or safety for the greater good of the Avengers and the world.
One common theme is identity. Peter has to figure out who he is now that he's part of a new family. For example, in many fanfics, he might struggle with whether he should still be the same Spider - Man or if his new family situation changes his superhero identity.
One common theme is acceptance. These fanfics often show Peter's friends and family coming to understand and accept his autism. Another theme is his unique way of seeing the world. His autism can give him a different perspective on things, which is useful in his role as Spider - Man.
One common theme is probably power and responsibility. Just like in the original Spiderman stories, Peter has to deal with the consequences of having great power. Another theme could be identity. He might struggle with his dual identity as Peter Parker and Spiderman in different ways in the Ultimate version. And friendship is also likely to be a theme, as his relationships with his friends are important parts of his character.