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 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 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.
One idea could be a story where Percy has to rescue his friends who have been turned to stone by Medusa. He uses his knowledge of Greek mythology and his demigod abilities to find a way to reverse the curse. Another idea is a pre - encounter story where Percy hears tales of Medusa and prepares himself for a possible future battle, learning from his mentors about how to face such a powerful enemy.
Well, it could be about the daughter of Medusa having some sort of adventure with Percy Jackson. Maybe she's trying to break free from the stigma of her mother's deeds. She could team up with Percy to fight a common enemy, like a new monster that has emerged from the Underworld. It would be interesting to see how Percy reacts to her, considering her heritage.
She could be portrayed as a protector. Maybe she lives in a dangerous part of the world where monsters roam freely. And she uses her power to turn those monsters into stone, protecting the innocent people who live nearby. Percy could then discover this side of her during his adventures.
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 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.
Well, in most Percy Jackson fanfics, there's no canon relation between Harry (from the Harry Potter universe which is often cross - over in fanfics) and Medusa. But if there is such a relation in a particular fanfic, it could be something like Harry is on a quest that involves Medusa's lair and through some magical or fated connection, he is related in the sense that he has to face the consequences of her actions or her presence in the magical world. Maybe he has to break a curse she placed on someone, which then makes them related in the context of the story.
One interesting Medusa fanfiction could be about her backstory before she became the monster we know in the Percy Jackson series. Maybe it explores her life as a beautiful priestess and what led to her transformation. Another could be a story where Percy and his friends have to face a different version of Medusa, one with some unexpected powers or motives. And there could also be a fanfiction that focuses on Medusa's relationship with other mythological creatures in the Percy Jackson world.
One idea could be that Percy discovers a magical blue food that gives him the ability to breathe underwater even better than normal. For example, he could find blue seaweed - like candy that when he eats it, his gills work more efficiently and he can communicate with sea creatures more clearly.