One plot twist could be that Percy discovers he has new powers related to Apollo's domain. For example, he might gain the ability to heal with a touch, which would be a huge change from his normal water - based powers. This could lead to him being in a moral dilemma, as he has to decide whether to use these new powers for good or if they will change him in a negative way.
Another plot twist could be that Apollo's adoption of Percy is part of a bigger plan. Maybe the gods are facing a new threat, and they need Percy, with his unique skills and now under Apollo's influence, to be a key player in the battle. This would put Percy in a whole new set of challenges and relationships with the other gods and demigods.
Well, one possibility is that Percy could gain new powers related to Apollo. For example, he might learn to heal more effectively or have a connection with the sun. Another aspect could be his relationship with Apollo's other children. He'd have to adjust to a new family dynamic within the godly realm.
One possible plot twist could be that Percy's dual - god heritage gives him unique powers. For example, he might have the ability to control both the moon and the sun to some extent. Another plot twist could be that the other demigods are initially suspicious of him due to his unorthodox parentage. They might think he's some kind of abomination or a trick by the gods. Also, there could be a prophecy related to Percy that involves uniting the powers of Artemis and Apollo in a way that no one has ever expected, like using their combined powers to defeat a new and extremely powerful monster that threatens the entire demigod world.
Well, one possibility could be that Percy, already a hero in his own right, finds himself in a situation where Apollo decides to adopt him. Maybe Percy has lost his connection to Poseidon for some reason, and Apollo sees his potential. Apollo could then train Percy in new ways of using his powers, not just related to water but also in areas like prophecy or archery, which are Apollo's domains.
One possible plot twist could be that Percy's demigod powers interact in unexpected ways with Loki's magic. Since Percy has control over water and Loki is known for his trickery, perhaps Loki uses Percy's powers to create illusions involving water, like making a dry desert seem like an ocean to deceive enemies.
Well, one possible plot could be Percy struggling to adapt to his new status as Apollo's adopted son. He might have to learn new powers related to the sun god. For example, he could start to have an affinity for healing, which is one of Apollo's main domains. And he would face challenges from other demigods who are jealous or suspicious of his newfound connection to a major god.
One possible plot twist could be Percy's struggle with his new identity. Since Zeus is the king of the gods, Percy might face a lot of envy and even threats from other demigods or minor gods who see him as having an unfair advantage. Another twist could be Percy's relationship with his old friends at Camp Half - Blood. They might feel betrayed or confused as to why Percy has been adopted by Zeus instead of Poseidon.
One possible plot twist could be that Rin's adoption of Naruto leads to him learning unique jutsu from her early on. Maybe she has some secret knowledge passed down in her family that she imparts to Naruto, which gives him an edge over his peers in the ninja academy.
Perhaps a really interesting plot twist could be that Percy's adoption by Erebus reveals a long - lost prophecy. This prophecy states that Percy, with his combined heritage of being Poseidon's son and Erebus' adopted son, is the key to either the destruction or the salvation of the entire Greek mythological world. This would put Percy in a very difficult position as he tries to figure out how to fulfill the prophecy in the best way possible, all while dealing with the reactions of other gods, demigods, and mythical creatures.
In this fanfiction, Percy's identity could be somewhat transformed. He may take on some of Apollo's traits. Maybe he becomes more confident in his appearance and charm, like Apollo. His combat style could also change. Instead of just relying on his swordsmanship and water powers, he could incorporate Apollo's archery skills. He would have to learn how to make and use arrows, and this new skill would make him a more versatile fighter. His relationship with other characters would shift too. Some might be jealous of his new connection with Apollo, while others would be curious about how he has changed.
One possibility is that Percy's relationship with the other demigods would change. Since he is now under the wing of Apollo and Artemis, some demigods might be jealous or curious. He could also become a sort of mediator between the two gods' followers. For example, if there were disputes between the Apollo - related campers and Artemis - related hunters, Percy could use his position to resolve them.