One interesting storyline could be about a new demigod arriving at Camp Half - Blood and having to prove themselves. They might face challenges that the original characters in the Percy Jackson series didn't, like dealing with a new type of monster that is specifically targeting new recruits. Another could be a fanfiction where the gods interact more directly with the campers in ways that are not in the original books. For example, Zeus coming down to give a special training session to the lightning - wielding demigods.
One interesting storyline could be about a new demigod arriving at Camp Jupiter and having to prove themselves in unique challenges. For example, they might have to face a long - forgotten Roman monster that has awakened near the camp. Another could be a love story between two characters from different cohorts within the camp, like a centurion falling for a new recruit. And there could also be a story where the campers have to deal with a mysterious prophecy that seems to point towards a great danger not just for the camp, but for the entire Roman demigod world.
A great storyline could also be about a group of demigods from Camp Jupiter going on a quest to retrieve a lost Roman artifact that is said to have the power to protect the camp from a new and powerful enemy. Along the way, they face various obstacles and have to use their Roman - themed powers and knowledge to overcome them.
Another storyline might involve Percy getting lost in the Egyptian afterlife. He has to navigate through the different realms with the help of Egyptian gods such as Thoth, who is known for his wisdom. Along the way, he discovers secrets about the connection between the Greek and Egyptian pantheons. This could include how their powers are related and how the two mythologies might have influenced each other in ancient times.
One interesting storyline could be Percy as a baby showing early signs of his demigod powers. Maybe he can control water in his crib, like making the bath water swirl around him in a mini - whirlpool. Another could be the reactions of the gods when they discover this new baby demigod. They might be worried about his potential or already planning how to use him in their future schemes.
There could also be a fanfiction where Percy has to face his inner demons in a more psychological way. Maybe he's haunted by the memories of all the battles he's fought and the friends he's lost. His friends then have to help him through this tough time, and in the process, they learn more about each other's deeper fears and insecurities.
One interesting storyline could be where Percy Jackson somehow ends up in Ariel's underwater world. Maybe he's on a quest that takes him there and he has to team up with Ariel to defeat a common enemy, like a sea monster that is threatening both the underwater kingdom and the surface world that Percy is from.
There could also be a fanfiction where the Hunters take in a new recruit who has a mysterious past. This new character might have powers that are unknown to the world of demigods and the Hunters have to figure out how to train and control these powers. Along the way, they discover that this new recruit is somehow connected to an old prophecy that could change the fate of the demigod world.
One interesting storyline could be a Futa Percy Jackson going on a new quest that involves saving a magical realm from an ancient evil. In this fanfiction, Percy's unique form might give her an edge in combat, like being able to use both male and female - like combat styles.
A really engaging storyline could be them being transported to a different era in the world of Greek mythology. They would have to adapt to the different rules and powers that exist in that time while still relying on their own abilities. This would put their friendship and skills to the test in a whole new and exciting way.
One interesting storyline could be a crossover where Percy Jackson meets the Crusaders in a modern-day setting. Maybe they have to team up to fight a common enemy that is threatening both the world of Greek mythology and the historical context of the Crusaders. Another could be Percy using his powers in a way that the Crusaders initially misunderstand, leading to some conflict before they realize they can work together.