In certain fanfictions, Percy's mom could be growing lemons in her garden, and these lemons are not ordinary. They might be a gift from a god or goddess. The lemons could have powers like granting temporary invisibility when consumed. This could play a significant role in the story, for example, when Percy needs to sneak into a dangerous place, his mom gives him a lemon to eat so he can pass unnoticed.
Well, in fanfiction, perhaps Calypso uses lemons in a spell to communicate with Percy when he's far away. Since Percy has a connection with her already, the lemons act as a sort of conduit. And then there could be a whole adventure where Percy has to find ingredients to strengthen this lemon - based communication spell to save Calypso from some danger.
One interesting storyline could be Percy and Zoe teaming up with Lemon on a quest. Maybe they are searching for a lost artifact that has the power to save the demigod world. They face various monsters along the way and have to use their combined skills, like Percy's water - controlling abilities, Zoe's archery skills, and Lemon's unique talents (which could be something like super - intelligence or the ability to communicate with animals).
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.
One interesting storyline could be Percy's first encounter with a mythological creature as a kid but in a more humorous way. For example, he mistakes a satyr for a really hairy kid at school and tries to befriend it not knowing what it really is.