Well, it could be that when Percy looks at Medusa, their minds get swapped. Percy then has to figure out how to use Medusa's powers and body to his advantage while also trying not to get killed by the heroes who are coming after 'Medusa' (who is really Percy in her body). And Medusa, in Percy's body, has to deal with his life, like his relationships with Annabeth and his friends at Camp Half - Blood, which could lead to some really interesting and comical situations.
A possible plot could be that Percy is sent on a quest where he accidentally stumbles upon Medusa in a different form, like a human - looking guise. They start to talk and gradually develop feelings for each other as they realize they both have their own loneliness and struggles.
Well, one possible plot twist could be that Percy discovers he has a new, hidden power that no one, not even the gods, knew about. Maybe it's a power related to his connection with the ocean in a way that's completely unexpected, like being able to communicate with long - lost sea creatures that hold the key to defeating the ultimate enemy. Another twist could be that a character who was thought to be an ally turns out to be working for the bad guys all along. This could be someone really close to Percy, like a fellow camper at Camp Half - Blood, which would really shake things up.
A really interesting plot twist could be that the blind woman's love is part of a prophecy. In the fanfiction world, prophecies are often used to drive the story. So, her love for Medusa could be the key to saving a whole kingdom or something huge. Maybe the two of them have to go on a journey together because of this prophecy, and along the way, they face all kinds of challenges that test their love and their resolve.
One possible plot twist could be that Percy is already in love with someone else, and Rachel's flirting makes things really complicated. He might be torn between his feelings for the other person and the new attention from Rachel.
One possible plot twist could be that Percy forgets not only his past but also his special abilities. So he has to relearn everything from scratch, and in the process, discovers new and unexpected powers within himself. This could lead to him being seen as a threat by some and a savior by others in the fanfiction world.
A possible plot twist could be that Percy's Titan - born nature makes him immune to certain types of magic that are usually harmful to demigods. This would give him an unexpected advantage in battles.
Perhaps Medusa has some crucial information that Percy needs to save the world, and in order to get that information, he has to protect her from other threats. So he embarks on a journey to keep her safe.
Well, perhaps a plot twist could be that Percy's friends think he's been kidnapped by someone else entirely. So they're looking in all the wrong places while Khione has him hidden away. Or, it could be that Khione kidnaps Percy but then realizes she's made a huge mistake because Percy has some sort of connection to a force that can destroy her. So she has to figure out a way to either let him go or use him to her advantage in a different way. Also, what if Percy is able to communicate with the elements in Khione's domain and he uses that to his advantage to escape or gain the upper hand?
Maybe Percy loses his powers temporarily during the battle with Typhon. This would completely change the dynamic of the fight and force him to rely on his wits and the help of his friends in a whole new way. He might have to find a magical item or perform a heroic deed without his powers to turn the tables on Typhon.
Well, a great plot twist could be that Percy is turned into a vampire but he was actually part of an ancient prophecy in the vampire world. As he struggles to adapt to his new life, he finds out that there are vampire hunters who are after him not just because he's a vampire, but because they believe he will bring about a great change in the vampire - human balance. Also, his transformation could be different from other vampires. Instead of craving blood right away, he has a strange attraction to something else, like the essence of magic, which is very un - vampire - like and causes confusion among the vampire clans.