Well, one plot twist could be that Percy kills the gods, but they are reborn in different forms. For example, Zeus is reborn as a young girl with all his powers intact. This would turn the whole story on its head as Percy now has to deal with these new incarnations of the gods he thought he'd defeated. And it could lead to a whole new set of adventures and challenges for him as he tries to figure out what to do with these reborn deities.
One interesting plot twist could be that Percy is mistaken for a god by a group of mortals who then start to worship him. This leads to Percy having to deal with the moral dilemma of whether to let them continue or reveal his true identity. Another could be that a real god gets jealous of Percy being mistaken for one and tries to frame him for something bad.
One interesting plot twist could be Percy having to deal with the other gods' jealousy. Since he's a new king, the old gods might not be happy with his rule. For example, Zeus might try to undermine Percy's decisions. Another could be Percy using his new powers in unexpected ways, like creating new mythical creatures. And a third could be Percy facing a threat from an outside force that the old gods couldn't handle but as king, he has to find a solution.
Perhaps the character is reborn with memories of a future event that threatens the Mikaelsons. This would put them in a position to either try to change the future or use it to their advantage within the family dynamics. They might face disbelief from the Mikaelsons at first, but as events start to unfold as they remembered, they gain more influence.
Another plot twist might be a time - related one. What if John gets transported back in time to the events of the Harry Potter series and meets a younger Hermione? His different perspective and knowledge from his own world could change the course of events in the wizarding world, creating a complex web of changes and consequences.
In some fanfics, a plot twist could be that Severus was actually protecting Hermione all along under Dumbledore's secret orders, and Sirius discovers this and has to re - evaluate his hatred for Severus. This completely changes the dynamic between the three.
One interesting plot twist could be that Naruto starts to have memories of Tobirama's past battles. This would make him question his own identity and purpose. Another could be that Tobirama's reincarnation in Naruto causes a shift in the power dynamics among the villages. It might make other villages see Konoha as a greater threat or as a source of new knowledge.
One of the most interesting plot twists could be that Naruto discovers a new form of chakra that has the power to rewrite history. This would completely change the power dynamics in the Naruto universe.
One interesting plot twist is that the chakra seal on Naruto is actually a key to an ancient power source. At first, it seems like a hindrance, but as the story progresses, it's revealed that the seal was placed there to protect this power until Naruto was ready. This flips the whole concept of the chakra seal from a negative to a positive in an unexpected way. Also, there could be a plot twist where the sealing of Naruto's chakra was a misdirect, and it was actually someone else's chakra that was being targeted, and Naruto was just a decoy.
In 'Frozen Bonds', the plot twist is that the Snow Queen has been manipulating events all along not for evil, but to protect Emma from a greater threat that she is unaware of. This flips the typical villain - hero perception on its head and makes for a really unique and thought - provoking story.
One possible plot twist could be a character from 'Twilight' getting superpowers like those in 'Heroes'. For example, Bella could suddenly gain the ability to fly or become invisible. This would completely change her dynamic within the 'Twilight' world and her relationship with Edward and Jacob. Another twist could be a 'Heroes' character becoming a vampire or a werewolf. It would introduce new challenges and moral dilemmas as they deal with their newfound nature.