One interesting 'Peter son of Bruce fanfiction' could be where Peter discovers he is Bruce's son through a series of mysterious events. Maybe he finds an old letter or some hidden family heirloom that leads him to this truth. Then, he has to deal with the shock of this new identity while also trying to balance his life as a superhero or a normal teen.
Family discovery is a common theme. As Peter finds out he's Bruce's son, he has to come to terms with a whole new family history and identity. Another theme is mentorship, with Bruce teaching Peter valuable skills.
The plot could involve Peter exploring his father's scientific research. Since Bruce is a brilliant scientist, Peter might be intrigued by his work on gamma radiation. He could get into trouble by trying to recreate some of his father's experiments without proper supervision, leading to unexpected and dangerous results.
In fanfiction, anything can happen. Maybe there was some sort of scientific experiment gone wrong or a strange twist of fate. For example, perhaps Banner's DNA was somehow mixed with that of Peter's parents during a top - secret project. This could lead to Peter being biologically related to Banner in the fanfiction universe.
If Peter is Banner's son in fanfiction, there could be a great deal of scientific exploration between them. Peter could learn a whole new level of science from Banner, and they could collaborate on projects. This would enhance Peter's intelligence even more. Also, Peter might struggle with the idea of being related to the Hulk. He'd have to deal with the public perception of his father and how that affects him as Spider - Man.
I really like 'Partners in Science'. In this fanfiction, Peter and Bruce start working together after Peter discovers some strange radiation that he can't figure out on his own. Bruce helps him analyze it, and their friendship grows throughout the story. It has some really cool action scenes where they have to fight off bad guys who are also interested in the radiation.
Peter's powers could also be a combination of Bruce's Hulk strength and something else. Maybe he has a more mental connection to his Hulk - like form. For example, he could use his intelligence to enhance the power of his transformation, rather than just relying on brute force like his father. He might be able to focus the gamma - energy in different ways, such as creating energy shields or blasts.
In some fanfictions, Harry could be Bruce Wayne's son. Fanfiction allows for a lot of creative liberties, so it's possible for authors to create such a relationship. However, it's not part of the official DC Comics canon.
Another theme is the exploration of their dual identities. Peter has to balance his life as a student and Spider - Man, and Bruce has his own struggles with the Hulk. Fanfictions often explore how they can relate to each other's problems and support one another in dealing with their identities.
Perhaps they would team up to fight a common enemy. Peter's agility and combat skills combined with Bruce's Hulk - like strength could make for a formidable duo. They could be facing a villain who is both a scientific threat and a physical menace.