One common theme is the clash of two different worlds. Percy comes from a world of magic and gods, while Bruce is from a scientific world. Fanfictions often explore how they deal with this difference.
One great 'Percy Jackson and Bruce Banner fanfiction' is 'The Demigod and the Scientist'. It has an interesting plot where Percy and Bruce meet during a strange scientific experiment gone wrong. They have to work together to fix things while also dealing with Percy's demigod powers and Bruce's Hulk problem.
One plot idea could be Percy and Bruce Banner teaming up to fight a new type of monster that is affected by both magic and gamma radiation. Another could be Percy getting lost in a scientific research facility where Bruce works and they have to figure out how to get Percy back to his world while also dealing with some lab - created threats. Maybe they also discover that there is a connection between the Greek gods and the science behind the Hulk.
Percy is a very adventurous person, always ready for a new quest and full of energy. Bruce Banner is a scientist, more reserved and used to a methodical approach. At first, they might not see eye to eye. Percy might think Bruce is too slow - moving, and Bruce might find Percy too reckless. However, as they get to know each other, Percy's sense of adventure could encourage Bruce to take more risks in his research in a good way, and Bruce's calm and logical thinking could help Percy when he needs to strategize during battles or difficult situations.
Sure, fanfiction writers love to mix and match different fictional characters. In a story where Percy Jackson is dating Bruce Wayne, we might see Percy's Greek mythology - inspired powers and Bruce's high - tech gadgets and detective skills combine in interesting ways. For example, Percy could use his water - controlling abilities to help Bruce during a flood in Gotham, while Bruce could use his resources to help Percy protect Camp Half - Blood from some new threat.
In fanfiction, Bruce is often portrayed as the brains behind many of the Avengers' strategies. His scientific knowledge is invaluable. At the same time, his struggle with the Hulk can be a source of both drama and humor. For instance, there might be scenes where he accidentally turns into the Hulk at the wrong moment, creating chaos but also a chance for him to show his strength.
Perhaps in a fanfiction, Bruce Banner discovers a new form of science that can enhance Thor's powers even more. Thor, in turn, helps Bruce understand the Asgardian view of the universe, which gives Bruce new insights into his own work. This could lead to a series of events where they team up against a common enemy that is a threat to both Earth and Asgard.
In fanfiction, they might be related through a shared enemy. Let's say there's a new super - villain who is causing chaos in both the demigod world and Gotham. Percy and Bruce start to work together to stop this foe, and during their investigations, they find out that there's a family connection between them. It could be something as simple as an ancestor who was part of a secret society that had ties to both the Greek mythology realm and the early settlers of Gotham.
One common theme is family. Since Uncle Bruce is related to Percy in some way in these fanfictions, they often explore the family bond, like loyalty and protection within the family. For example, in many stories, Uncle Bruce will go to great lengths to protect Percy from danger.
Loki may also kidnap Bruce Banner as a way to get at the Avengers. Since Banner is an important part of the team, taking him hostage could be a strategic move to draw out the other Avengers and then manipulate or defeat them. It could be part of a bigger scheme to gain power or control over Earth or the universe.