They can interact through battles. For instance, if a powerful villain threatens both their worlds, they would fight side by side. Percy could use his sword - fighting skills along with the X - Men's mutant powers.
One interesting 'Percy meets X - Men' fanfiction could be where Percy's powers from his world interact with the mutant abilities of the X - Men. For example, his control over water could be used in combination with Iceman's powers in some epic battles against a common enemy.
One possible scenario could be that Quicksilver uses his super - speed to save an Avenger from a sudden attack. His speed would be a great asset to the Avengers in a fight. Maybe he teams up with Scarlet Witch, his sister, who is also involved with the Avengers in some storylines.
Well, it might involve Spiderman being initially mistrusted by the X - Men. He's from a different world of superheroes after all. But then they could discover they have a common goal in protecting mutants and non - mutants alike. There could be some really cool interactions between Peter Parker's nerdy side and the more diverse personalities in the X - Men, like Wolverine's gruffness or Jean Grey's telepathic insights.
He could introduce new combat techniques to the Avengers. Since he moves at super - speed, he might have ways of fighting that the Avengers haven't seen before. For example, he could create a mini - tornado by running in circles really fast around an enemy.
In a 'Percy Meets Paul' fanfiction, Percy could be a demigod, like in the Percy Jackson series. He has powers related to the Greek gods. Paul, on the other hand, could be a normal human who is very intelligent and curious. Their meeting could be a chance encounter, like Percy accidentally stumbling into Paul's life while on a mission. Or Paul could be someone who has been unknowingly drawn into Percy's world of magic and mystery.
In this fanfiction scenario, Ahsoka meeting Krell's men could lead to a lot of interesting plot developments. Maybe she tries to understand their motives under Krell's command. She might even attempt to turn them against Krell if she discovers his true nature. It could be a story full of action, with Ahsoka using her combat skills to gain their respect and then persuade them to do the right thing.
The interaction between Spiderman and Wolverine would be really interesting. Wolverine's tough and no - nonsense attitude contrasted with Spiderman's quippy and more light - hearted nature. They could have some great banter while fighting side by side.
In this kind of fanfiction, they might have an adventure together. Maybe they'll face a new monster that they haven't encountered before. For example, a mythical creature from a less - known part of Greek mythology.
In this fanfiction concept, imagine Savitar being from a different dimension and accidentally stumbling into the Percy Jackson universe. He doesn't understand the rules at first. The demigods are initially scared of him because of his speed and strange powers. But Annabeth, being the smart one, figures out a way to communicate with him. Through their interactions, Savitar starts to question his own motives and actions, leading to a character arc where he may even end up helping the demigods against a greater threat.