The discovery that there are multiple prophecies related to Percy and his friends is also a great plot twist. It not only makes the characters realize their fates are intertwined with something much bigger but also keeps the readers on the edge of their seats, wondering how they will fulfill or avoid these prophecies.
In the stories, the revelation about Luke being a traitor is a big plot twist. He was initially seen as a friend and mentor to Percy. But later, it turns out he has his own dark motives and is working against the gods, which adds a lot of complexity and danger to the story.
In some fanfics, a plot twist could be that a demigod turns into a vampire. This completely changes the dynamic as they now have to deal with their new vampiric nature while still having their demigod powers. It's a really unique take on the crossover.
One interesting plot twist could be that Percy discovers a way to nullify Kratos' god - given powers. Maybe he finds an ancient artifact during the fight that has the ability to do so. Another could be that Kratos, instead of seeing Percy as an enemy, realizes they have a common goal against a greater evil in the fanfiction world and they end up teaming up.
One interesting plot twist could be that Percy's water powers somehow interact with Elsa's ice powers in unexpected ways. Maybe when they meet, their powers combine to create a new form of frozen water element that has unique properties. Another could be that the demigods from Percy Jackson's world have to deal with the magical cold of Arendelle, which is a whole new kind of challenge compared to their usual Greek - related threats.
In some fanfics, a plot twist might be that the Death Note has some sort of connection to the Greek underworld. Maybe it was created by Hades as a way to control the souls in a different way, and when Light Yagami starts using it, he unknowingly disrupts the balance between the mortal world and the underworld. This could lead to Percy and his friends having to step in and deal with both Light and the chaos in the underworld.
Perhaps a plot twist where the Mist from Percy Jackson's world starts to affect Tokyo Ghoul. The Mist could make humans in Tokyo see ghouls as something completely different, like mythical creatures from their own Japanese folklore. This would not only change how the humans in Tokyo Ghoul react to ghouls, but also how the ghouls themselves perceive their place in the world and their relationship with humans.
Another cool plot twist could be that the two universes start to merge because of some ancient magic or a scientific experiment gone wrong. Percy and Darcy then have to work together to stop the complete chaos that ensues. This not only forces them to combine their skills but also brings in a whole new set of challenges as they deal with characters and elements from both universes colliding.
Well, in some fanfictions, a great plot twist is that Percy, being born a god, discovers he has a connection to an entirely different pantheon than expected. Maybe he thought he'd be a Greek god like Poseidon, but instead has ties to the Norse gods. Another interesting turn is when his birth as a god is part of a much larger scheme by an ancient and powerful entity. And then there are those where Percy's new godly status causes a rift between him and his mother, as she struggles to accept this new version of her son.
One interesting plot twist could be when Atalanta turns out to be a long - lost relative of one of Percy's friends. This completely changes the dynamic between them and adds a whole new layer of complexity to the story.
One interesting plot twist could be that they find out they are related in some way through the complex web of mythology. Maybe there's a long - lost ancestor who was part of both Greek and Norse worlds. Another could be that they are forced to swap powers. Percy has to deal with Magnus's Norse magic and Magnus has to handle Percy's water powers. It would be really cool to see how they adapt.
In some fanfictions, a really cool plot twist could be that Percy's Hela - given powers are slowly corrupting him. He starts to see the world in a different, darker way. His friends notice the change in him but don't know the cause at first. As he struggles with this corruption, he has to find a way to either embrace it and use it for good in a new way, or find a way to get rid of it. Also, imagine if Percy discovers that he has a half - brother or sister from Hela's side in the Norse world, and this new relative has a completely different view on life and power, which causes more drama and conflict for Percy.