Create a plot where the worlds of 'Percy Jackson' and 'Rough Lemon' are merging. This causes chaos as the rules of both worlds collide. Percy has to find a way to stop the merge before it destroys both universes. He teams up with some of the native characters of 'Rough Lemon' who have their own reasons for wanting to save their world. They journey through both worlds, facing challenges that are a combination of the threats from each world.
A unique plot could involve a prophecy that links Percy Jackson and a character from 'Rough Lemon'. The two have to team up to fulfill the prophecy. Along the way, they face many obstacles. They have to learn about each other's cultures and powers. Percy has to teach the 'Rough Lemon' character about the Greek gods, and the 'Rough Lemon' character teaches Percy about the magic of their world.
Well, you could start by thinking about the two universes you want to cross. For example, if it's Percy Jackson and Star Wars. Maybe Percy gets transported to the Star Wars universe. He could use his powers in unique ways, like using water manipulation to deal with the desert planets. His demigod abilities would be seen as a strange and new force in that galaxy.
You could start with a mystery. For example, Nephilim artifacts start showing up in the Percy Jackson world. Percy and his friends suspect foul play and begin to investigate. As they dig deeper, they discover a connection to the Nephilim. This leads to a journey into the Nephilim realm where they must navigate different rules and powers.
You can start by combining different traits of existing monsters. For example, create a character that is part minotaur and part mermaid. This hybrid would have the strength of a minotaur and the aquatic abilities of a mermaid. It could have a unique backstory like being an outcast from both minotaur and mermaid communities.
One way is to make their tattoos a part of their backstory. Maybe a character has a tattoo that was given to them by a mythical creature they once saved. The tattoo has a special bond with that creature, and it gives the character an advantage in certain situations. For instance, if the tattoo was from a centaur, it could give the character enhanced speed and archery skills when they touch the tattoo. This kind of unique connection to their tattoo helps create a distinct character in the Percy Jackson fanfiction world.
You could create a character who is a descendant of an ancient being associated with the Styx. For example, a half - human, half - river spirit. This character could have unique abilities like being able to manipulate the waters of the Styx in ways that Percy can't. They could also have knowledge of the river's deepest secrets, which would be useful in the story.
I've read one where the lemon is actually a disguised god. Percy and Sally don't realize it at first, but as the story progresses, they discover the true nature of the lemon - god. It's a really unique take on the Percy Jackson universe and the relationship between Percy, Sally and this strange entity.
One idea could be a crossover where Percy Jackson accidentally stumbles into the world of 'Rough Lemon'. Maybe he has to use his demigod powers to solve the unique problems there. For example, he could use his water - controlling abilities to deal with a drought that is plaguing the 'Rough Lemon' land.
There is one fanfiction that features a Titan who has lost his memory and befriends the demigods. The demigods don't know he's a Titan at first. As the story progresses, they discover his true identity and have to decide what to do with him. It's a very different take on the relationship between demigods and Titans and has a lot of mystery and suspense throughout.
There's a fanfiction where the demigods react to a group of mortals who know all about them. It's a very interesting plot as the demigods have to deal with the fact that their secrets are out and how these mortals might use that knowledge. It has a lot of mystery and suspense throughout.
A great one is 'Percy Jackson: The Seer's Prophecy'. In this fanfiction, Percy's seer powers are linked to an ancient prophecy. His visions show him fragments of a future that could either save or destroy the world of demigods. What makes it unique is that his seer abilities are not like the typical ones. He doesn't just see the future, but he can also interact with the visions in a way, like changing small details that then have a big impact on the real world.