Well, Naruto is a natural choice given his popularity and his growth throughout the Naruto series. Percy Jackson, being the hero of his own series, would also be a main character. In terms of the Uchiha, Madara could be an interesting main character. His grand ambitions and extremely powerful abilities could create a lot of conflict. He might initially be an antagonist but could later join forces with Naruto and Percy. This would create a story full of power struggles, character development, and epic battles.
Naruto, of course, would be a likely main character. His positive attitude and determination would make him a great fit. Percy Jackson too, with his heroics and ability to lead. And from the Uchiha clan, Sasuke could be a main character. His complex personality and powerful Sharingan abilities would add a lot of drama to the story.
It could be really exciting. Imagine Naruto and Percy Jackson teaming up. Naruto with his ninja skills like shadow clones and rasengan, and Percy with his control over water and ability to fight monsters. And if an Uchiha from Naruto, say Sasuke, gets involved, his Sharingan powers would add another layer of intrigue. Maybe they'd all be on a quest to save both the ninja world and the world of Greek gods from some common threat.
Obviously Percy would be one of the main characters. He could lead the way in exploring the crossover world. His Pokemon partner might be a strong and loyal one. Annabeth could also be a main character, using her intelligence to strategize in Pokemon battles. Grover might tag along, befriending some unique Pokemon. And maybe some of the Pokemon themselves could be considered main characters, like Pikachu if it made an appearance in this crossover world.
Perhaps a rogue demigod who has made a deal with a speed - based meta - human villain from the Flash's world. Together, they plan to take over both the magical realm and Central City. The demigod could use his powers in combination with the meta - human's technology to create some really tough challenges for Percy and the Flash.
Definitely Yugi and Percy. Yugi is the heart of the Yugioh series with his connection to the Millennium Puzzle and his dueling skills. Percy, on the other hand, is the hero of the Percy Jackson series, a demigod with his own set of powers. They would be the ones to bring the two worlds together and lead their respective groups in any adventure or conflict.
Obviously, Annabeth Chase could be one of the main characters in the harem. She already has a strong connection with Percy. Then, there could be Thalia Grace, with her cool and powerful demigod nature. From other mythologies, Artemis could be an interesting addition. Despite her vow of chastity, in a fanfiction world, she could be drawn to Percy in a different way. Also, maybe a character like Katara from Avatar: The Last Airbender could be brought in through some sort of crossover magic, adding an element of water - bending to the mix.
In a 'naruto garra percy jackson crossover fanfiction', it could start with Percy Jackson being sent to the Naruto universe by some strange magic. There, he meets Naruto and Garra. They soon realize that there are dark forces at work in both their worlds that are connected. They embark on a journey to find the source of this evil. Along the way, Naruto shows Percy his village and the way of the ninja. Garra shares his past and how he overcame his inner demons. Percy, in turn, teaches them about Greek mythology and the powers of the demigods. As they get closer to the source of the evil, they must combine their unique skills and knowledge to defeat it.
A great plot could involve a prophecy in both the Naruto and Percy Jackson worlds. The prophecy states that only by combining the powers of the ninja and the demigod can a great evil be defeated. Naruto and Percy are chosen to fulfill this prophecy. Along the way, they face challenges like trying to understand each other's cultures. Naruto has to get used to the Greek pantheon, and Percy has to learn about chakra. They also have to deal with their own insecurities. For Naruto, it could be his fear of not being strong enough without the Nine - Tails' power, and for Percy, it could be his fear of losing his friends in the battle.
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.
For sure Percy. A merman who is an outcast among his own kind because he has a unique ability that others are jealous of. And Nico di Angelo could be another main character. Nico's connection to the underworld might play an interesting role when dealing with the merman's world which is so different from the underworld but still has some similarities in terms of being a hidden and often misunderstood realm.
Percy might meet Sherlock Holmes. Sherlock would be intrigued by Percy's world of gods and monsters. Percy could ask Sherlock for help in solving a mystery in the mortal world that is somehow connected to the world of the demigods. And Sherlock could use his deductive skills to figure out some secrets about the demigod world.