Another concept could be that a powerful ancient evil is affecting both the Percy Jackson universe and Arendelle. Elsa and Percy are the only ones who can sense it at first. They must team up, traveling between their two worlds, to find the source of the evil. Along the way, they learn about each other's powers and cultures, and their combined powers are the key to defeating the evil.
One idea could be that Percy and Elsa meet when some sort of magical rift pulls them into the same world. Percy's water powers and Elsa's ice powers could either clash or combine in interesting ways. For example, they might have to work together to stop a new threat that is causing chaos with water and ice elements in the merged world.
One idea could be that Percy, with his water powers, and Elsa, with her ice powers, team up in a magical realm. They could face a common enemy that threatens both their worlds. And as they work together, they start to understand each other's powers more deeply, leading to a strong bond.
One idea could be a fanfiction where Percy and his friends go on a new quest in a modern, urban setting. Instead of the usual mythological locations, they have to deal with monsters hiding in big cities. Another idea is a story that focuses on the relationships between the characters in a more in - depth way, like exploring the friendship between Percy and Grover during their off - quest times. And a third idea could be a time - travel fanfiction, where Percy gets sent back to the time of the ancient Greek heroes and has to interact with them while still holding onto his modern values.
One idea could be to explore Percy's life after he has fully mastered his powers. Maybe he goes on a quest to find a long - lost relative who also has demigod powers. Another could be a story where Percy and his friends have to deal with a new type of monster that is immune to their usual weapons and they have to find a creative way to defeat it.
For Percy, his loyalty and sense of adventure can be emphasized. He could be the one to initiate contact with Elsa, seeing her as a new and exciting mystery. His skills in combat and his ability to think on his feet would come in handy when they face challenges together. For Elsa, her growth from a withdrawn and fearful queen to someone more open and trusting can be shown. Meeting Percy, who is so different from the people in her world, could be a catalyst for this change.
Percy's development could involve him using his skills in a new way. For example, his ability to control water could be combined with Elsa's ice in creative ways. This would make him more adaptable. Elsa could develop by seeing Percy's loyalty to his friends and trying to form deeper connections herself. As they interact more, they could influence each other's values. Percy might become more patient like Elsa, and Elsa could become more bold like Percy.
One idea could be a crossover where Harry and Percy meet in a magical realm that combines the wizarding world and the world of Greek gods. They could team up to fight a common enemy, like a dark wizard who has also angered the gods.
One idea could be a fanfiction where a character gets a tattoo of Percy's sword, Riptide. The tattoo could have magical properties in the story, like glowing when danger is near. Another idea is a tattoo of the Camp Half - Blood logo. It could be a symbol of pride for a demigod character in the fanfic, and maybe it was given to them as a mark of their belonging to the camp.
Another interesting concept is a story where Percy Jackson is somehow transported to the Marvel universe. He could use his water - controlling powers in unique ways there. Maybe he'd join forces with Namor, the Sub - Mariner, and they'd have an underwater adventure together, facing off against some underwater threat that only their combined powers could handle.
In Ambrosia Percy Jackson fanfiction, one interesting idea could be new uses of ambrosia. For example, it might be used to heal not just physical wounds but also emotional traumas. Some fanfictions may explore how different characters react to ambrosia in unique ways. Like a new demigod who has never tasted it before might have a very different experience compared to Percy.