It could be a really wild and unique story. Imagine Percy Jackson, a demigod with his powers, facing off against the creepy Slenderman. Maybe Percy uses his water powers to try and fend off Slenderman's mind - control or something. It would be a battle of two very different mythologies, one from Greek mythology and the other from modern horror lore.
A Percy Jackson and Slenderman fanfiction could start with Percy having strange dreams about a tall, faceless figure. He initially dismisses them as just nightmares, but then things start to happen around Camp Half - Blood. People start disappearing, and there are signs of Slenderman's presence. Percy teams up with Annabeth and some of his other friends. They discover that Slenderman has some sort of connection to an ancient, dark power that was once sealed away. Now they have to race against time to find a way to seal it again before more chaos is unleashed.
Well, in such a fanfiction, there could be a lot of crossovers. For example, the combat styles of Naruto like taijutsu, ninjutsu could be pitted against the monsters in the Percy Jackson world. And as a mercenary, the main character might have a different moral code compared to the regular heroes. They could be more self - interested at first but then grow to care about the bigger picture. It would be a fresh take on both universes and would attract fans of both series.
Well, in such a fanfiction, the ten - tailed beast might see Percy Jackson as a strange new threat. Percy, on the other hand, would be amazed by the chakra - based powers in Naruto's world. He might try to understand how the ten - tailed beast's power works and use that knowledge to his advantage. Naruto could learn from Percy's experiences with Greek gods and monsters, and they could combine their skills to take on any villains that might show up in this crossover world.
It could be really interesting. Maybe Percy could find himself in the world of Romeo and Juliet and use his demigod powers to try and change the tragic ending. He might face challenges from the feuding families while also dealing with the magic and rules of the Verona setting.
Perhaps there's a plot where the dinosaurs are being used by an evil force. The evil force has found a way to control the dinosaurs and is using them to attack the demigod camps. Percy and his friends then have to figure out how to break the control and save the day. They might find out that the dinosaurs have a connection to an old Greek god or goddess that they didn't know about before.
One idea could be that Percy Jackson discovers a hidden Cybertronian relic. This relic has the power to control water in a way that even Poseidon's trident can't. The Autobots and Decepticons are both after it. Percy has to team up with the Autobots to keep it out of the Decepticons' hands and also figure out how it relates to his world of Greek gods.
In a fanfiction, perhaps the gods in the Percy Jackson universe are aware of Cthulhu as an ancient and powerful being from another realm. They send Percy on a quest to learn more about Cthulhu's weaknesses in case he ever wakes up fully. Percy teams up with some of his demigod friends and they encounter all sorts of Lovecraftian horrors along the way. They soon realize that Cthulhu's power is far greater than anything they've ever faced and they have to rely on their wits and some newfound magic to survive.
One idea could be that Percy and his friends find themselves in the Star Wars universe. Maybe they land on a planet that's rich in water, like Naboo. Percy could use his water - controlling abilities to help the locals against some kind of threat, like the Trade Federation. Meanwhile, the Jedi could sense the different kind of power Percy has and be both intrigued and cautious.
One way their worlds could collide is through the concept of magic. In the Percy Jackson universe, there's Greek magic, and Doctor Strange is a master of the mystic arts. Maybe Percy could end up in the Sanctum Sanctorum by accident and Strange has to figure out how to send him back to his world. It would be a wild adventure as Percy's demigod powers might react strangely to the magic in Strange's world.
One way could be through the use of portals. Maybe there's a rift in the fabric of reality that connects the world of Percy Jackson to the realm where Slenderman exists. Demigods could accidentally stumble upon it and find themselves face - to - face with the horror. Another way could be a spell gone wrong. A magician in the Percy Jackson universe tries to do a powerful spell and instead of the intended result, it summons Slenderman.
In this fanfiction, the gods in Percy Jackson's world are intrigued by Poison Ivy's power. They bring her to Olympus to study her. Percy is assigned to be her guide while she's there. Along the way, they discover that there are similarities between the magic in Poison Ivy's world and the divine powers in Percy's world. They start to experiment with combining their powers, like Percy using his water powers to help Poison Ivy's plants grow in unexpected ways, and Poison Ivy using her plants to create shields for Percy during his training sessions.