One idea could be Percy using his water powers in a unique way against Medusa. For example, he could create a water shield that reflects Medusa's petrifying gaze back at her in a fanfiction. Another could be a scenario where Medusa, instead of being an enemy, teams up with Percy to face a greater threat.
A great lemon fanfiction idea could involve a magical item that binds Percy and Medusa together in some way. They have to work together to break the bond, but during this time, they start to understand each other on a deeper level. Percy could learn about Medusa's loneliness and she could see his courage. This could lead to a series of events where they grow to respect and even care for each other in a way that is different from the original story.
One idea could be Percy has to face Medusa again, but this time she has an army of stone minions. Another could be that Medusa was actually cursed by a more powerful god and Percy has to find a way to break it. Maybe Percy discovers Medusa has a long - lost relative who is being held hostage and he has to make a deal with her.
One idea could be Percy having to face Medusa in a new way that challenges his usual methods. Maybe he gets trapped in a dream where Medusa has the upper hand and he has to use his wits more than his sword. Another could be a scenario where Medusa is somehow redeemed and teams up with Percy against a greater evil. For example, an ancient monster that threatens both the mortal and mythological worlds.
One idea could be that Percy has to face a new threat from Medusa's long - lost sister who has even more powerful petrifying abilities. He has to use his skills and some newfound knowledge about the Gorgon lineage to defeat her.
In a fanfic, perhaps Percy and his friends accidentally stumble upon Medusa's lair while on a quest. But instead of immediately attacking, Medusa offers them a deal. She says she will give them a valuable clue to complete their quest if they help her get revenge on one of the minor gods who wronged her in the past. Percy and his friends then have to decide whether to trust Medusa or not.
One interesting idea could be the crossover of Percy Jackson with other mythologies in a unique way in the fanfiction. For example, combining the Greek mythology elements from Percy Jackson with Norse mythology. This can create new and exciting adventures for the characters. Another aspect could be exploring different character relationships in a fresh light. Maybe seeing how Percy would interact with characters from another fictional universe in a situation that tests their loyalties and abilities.
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.
A plot could be that Sally Jackson plants a lemon tree in her garden that turns out to be a gift from a minor goddess. The lemons from this tree have the power to give those who eat them the ability to see through illusions for a short time. Percy uses these lemons to his advantage when he is on a mission to retrieve a powerful artifact that is guarded by a monster that uses illusions to protect it.
Well, perhaps Aphrodite decides to give Percy a love lesson. Since he has had some rocky relationships. She could take him on a journey through different love stories in Greek mythology, showing him how to handle different situations. And as for the lemon part, it could be a situation where Aphrodite uses her charm to make Percy feel a bit flustered and his face turns red like a lemon. It would be a cute and funny scenario.
Well, perhaps a plot where Percy discovers that his father has a secret lemon - related past. Maybe Poseidon once made a deal with a lemon - loving deity and now there are consequences. For example, every time Poseidon gets angry, lemons start falling from the sky around Percy. This could lead to all sorts of humorous and adventurous situations as Percy tries to figure out how to break the curse.
One idea could be the hellhound having a secret bond with Percy. Maybe it starts out as a dangerous encounter but as Percy tries to understand the hellhound's motives, they form an unexpected alliance. This could lead to them facing off against common enemies in the Percy Jackson universe.