A fanfiction could explore the idea of Kakashi and Percy having to complete a quest together. Kakashi's intelligence and strategic thinking would blend well with Percy's instinct and ability to make quick decisions in dangerous situations. They might have to journey to a place that combines elements of both the Naruto and Percy Jackson worlds, like a mythical ninja temple guarded by a hydra, and they would have to rely on each other's skills to succeed.
One possibility could be that Kakashi, with his ninja skills, somehow gets transported to the Percy Jackson universe. He might team up with Percy and use his Sharingan to see through the mist that often confounds mortals in the Percy Jackson world. His combat skills would be a great asset against the various monsters they face.
In a crossover, Kakashi could be mistaken for a demigod at first. Maybe he has some latent power that is misinterpreted in the Percy Jackson realm. Percy would be intrigued by Kakashi's calm and collected demeanor, especially in the face of danger. They could exchange combat techniques, with Kakashi teaching Percy some ninja stealth moves and Percy showing Kakashi how to better fight mythical creatures.
Definitely Kakashi and Percy. They are both protagonists in their own right, and seeing how their different personalities interact would be fascinating. Percy is impulsive and has a strong sense of justice, while Kakashi is more reserved and calculating.
A 'Percy Jackson Skyrim Crossover Fanfiction' could involve Percy getting lost in Skyrim. He would have to adapt to the different magic system there. His sword - fighting skills and his powers over water could make him a very unique character in the Skyrim world. For example, he could use water to put out dragon fire or find hidden underwater caves that are full of treasures and ancient Skyrim secrets.
One idea could be a crossover with the Harry Potter universe. Kakashi could be a visiting wizard from another dimension, teaching the students at Hogwarts some of his ninja skills. Another could be a crossover with the Avengers. Kakashi's stealth and combat skills would make him a great addition to the team, and it would be interesting to see how he interacts with the likes of Iron Man and Captain America. A third idea might be a crossover with the Lord of the Rings. Kakashi could be a ranger in Middle - earth, using his Sharingan to detect the presence of orcs and other dark forces.
It could be a really exciting story. Imagine Naruto's ninja skills combined with the powers of the Juubi in the world of Percy Jackson. Naruto might use his Rasengan against some mythical monsters. And Percy could show Naruto the underwater world of the demigods. The two different mythologies and power systems would create a lot of interesting conflicts and friendships.
He might be an antagonist at first. His different set of powers and his somewhat aloof nature could make the demigods view him as a threat. But as the story progresses, they could discover that he's actually on their side and has his own reasons for his actions. For instance, he could be trying to stop a greater evil that the demigods are not aware of yet.
One way could be by making him a mysterious new demigod. He could have his Sharingan ability which might be related to some special power in the Percy Jackson universe, like being able to see through the Mist more clearly than others.
Well, in a 'Percy Jackson and Twilight crossover fanfic', there could be a plot where the threat of a common enemy forces Percy's gang and the Cullens to team up. The demigods' skills in combat and their connection to the gods could be combined with the vampires' superhuman abilities like speed and strength. It could also explore how the different mythologies in both universes interact. Like, how would the Greek gods view the existence of vampires? And would the Twilight vampires be affected by the magic that exists in the Percy Jackson world?
It could be that Harry, after the defeat of Voldemort, is bored with the wizarding world and somehow stumbles upon a portal to the Naruto universe. There he meets Kakashi and is so impressed by his cool demeanor and powerful jutsu that he decides to become his apprentice in a way, learning about chakra and how to use it in the context of his own magic.
First, you need to know both universes well. If it's a crossover with, say, the Naruto and One Piece worlds, understand the rules, characters, and settings of both. For Kakashi, focus on his personality traits like his calmness and intelligence. Then, create a good plot that makes sense for both universes to collide. Maybe a portal opens between the two worlds. Next, keep the characters in - character. Kakashi should act like himself even in a new world. And don't forget to have some action and interesting dialogue to keep the readers engaged.
Perhaps Percy is on a quest related to Poseidon and accidentally crosses paths with Aquaman. They initially have a misunderstanding, thinking the other is a threat. But then they realize they both have a common goal - to protect the seas. So they team up to stop a group of evil sea witches who are polluting the ocean and causing chaos among the sea life. Aquaman uses his trident and connection to the ocean's life, while Percy uses his sword and his wits to outsmart the witches.