One possible plot could be Percy Jackson being chosen by Apollo to complete a special quest. Maybe he has to retrieve a lost artifact of Apollo that is crucial for maintaining the balance between the gods. Along the way, he might face various monsters and challenges, like fighting against the minions of a dark god who wants to use the artifact for evil purposes.
One main antagonist could be Nyx, the goddess of the night. Since Apollo represents the sun, Nyx might see Percy as a threat as he is the champion of Apollo. She could try to plunge the world into eternal darkness and send her monstrous children to stop Percy.
A plot could involve Naruto being sent to the Percy Jackson universe through some kind of magical accident. He meets Apollo, who is intrigued by Naruto's chakra and ninja techniques. They team up to stop an ancient evil that threatens both the ninja world and the world of the demigods. Along the way, Naruto has to adapt to the new rules and powers of the demigod world, while also teaching some of his ninja wisdom to Percy and his friends. There could be epic battles where Naruto's Rasengan combines with Apollo's solar powers to defeat powerful foes.
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 could be Percy discovering new powers bestowed upon him by Hecate. He might have to use these powers to navigate a mysterious underworld realm filled with strange creatures. Along the way, he could meet new allies who are also under Hecate's influence.
Well, one possibility could be that Percy is chosen by Aphrodite for a special mission. Maybe he has to use the powers of love and charm in a unique way. For example, he might need to convince a group of warring mythical creatures to make peace by appealing to their feelings. He could find himself in situations where his normal combat skills aren't enough and has to rely on Aphrodite - given abilities like enhanced persuasion.
Maybe Percy discovers that there is a conspiracy within the Underworld to overthrow Hades. As the champion, he has to uncover the truth and stop the plot. Along the way, he meets old enemies who now see him as an ally of Hades and try to take advantage of the situation.
Well, one possibility could be that Percy is reluctantly drawn into Khione's service. Maybe she offers him a deal to save his friends or Camp Half - Blood from some greater threat. The plot could involve Percy having to use his unique skills and powers in ways that go against his usual moral code at first, but as he learns more about Khione's true motives, he finds a way to turn the situation around and defeat her in the end.
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.
Well, it could be about Apollo losing his powers completely and Percy trying to help him but failing. Maybe Percy feels sad because he can't do much for his friend. And Apollo is in despair as he is no longer the powerful god he once was.
Well, it could be about Apollo's over - confidence. He might have boasted about his powers or achievements in a way that annoyed Artemis. In the context of the Percy Jackson universe, Artemis is very protective of her domain and those associated with her. If Apollo made a decision regarding something that was under Artemis' purview without consulting her, like interfering in the affairs of the hunters, Artemis would yell at him. Also, Apollo's past mistakes or actions that went against the values of the gods might be brought up by Artemis during her yelling.