The plot could be really interesting. Maybe Percy's journey before being adopted by Ares was full of hardships. Ares decides to adopt him, thinking he can use Percy for his own purposes. Percy, on the other hand, starts to discover a different side of himself under Ares' guidance. He may be exposed to more brutal forms of combat and strategies. Along the way, Percy could face moral dilemmas as he tries to balance Ares' war - like values with his own sense of right and wrong.
Well, perhaps Percy has lost his original family or home in this fanfic. Ares, being the god of war, might see potential in Percy. He could adopt Percy to train him to be a great warrior. Percy might struggle with Ares' rough and war - like ways at first, but then gradually adapt and learn unique combat skills from him.
There could be Clarisse. Since she is Ares' daughter in the original Percy Jackson series, she might play an important role. She could be either jealous of Percy getting her father's attention or become a sort of mentor - like figure to him. Another character could be Annabeth. She might be worried about Percy being adopted by Ares and try to rescue him or at least check on him regularly.
Well, it could be that Percy is fighting Ares to protect his friends. Maybe Ares has threatened Percy's loved ones in Camp Half - Blood, so Percy has no choice but to face the god of war.
Well, it could be about Percy discovering he has this unexpected connection to Ares. And then he has to deal with the reactions of his friends like Annabeth. Some of them might be distrustful of this new relation. Percy would then try to find out more about his connection to Ares through exploring old prophecies and ancient sites, all while trying to keep his regular demigod duties in check.
One possible plot could be that Ares and Aphrodite's secret relationship is somehow discovered by Percy and his friends. Percy then has to decide whether to expose them or use this knowledge to his advantage in the ongoing power struggles among the gods. Maybe Aphrodite tries to charm Percy into keeping the secret, while Ares threatens him. This would create a lot of tension and moral dilemmas for Percy.
Well, in this fanfiction, perhaps Percy is adopted by Hera to serve as a bridge between the gods and the demigods. Hera might see his potential to unite both groups and decides to take him under her wing. Percy then has to navigate the complex politics of Olympus while still maintaining his relationships with his demigod friends.
Maybe in the fanfiction, Percy is on the verge of death in a battle. Chaos, who has been observing Percy for a while, decides to save him and adopts him. Percy then embarks on a journey in Chaos's realm. He could be trained by powerful beings there and form new alliances. His relationships with his old friends from his previous life might be strained as they don't understand his new situation, but he also gains new friends who are loyal to him because of his connection to Chaos.
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.
Well, it could be about Percy having a new life in the realm of the gods. Maybe he gets special powers and training from them. He might also face new enemies that are threats to the gods, and he has to use his newfound abilities to protect the divine world.
A plot could be that Percy is given a prophecy that involves him having to form a new kind of family unit. He decides that adopting Thalia is part of fulfilling that prophecy. But in order to fully embrace this new family, they need to go on a journey to different mythological realms. In each realm, they face different challenges that test their relationship. For example, in the Underworld, they have to deal with Hades who is not too happy about their new arrangement. This forces them to rely on each other and grow closer as they overcome these obstacles.
Well, one possible plot could be Percy discovering new powers. Since Hecate is the goddess of magic, Percy might learn magical abilities he never knew he had. Maybe he starts to see magic in everyday things in a way he didn't before. For example, he could make inanimate objects come to life or use spells to protect himself and his friends. Another aspect could be his relationship with Hecate. She might be a strict but loving mother figure, teaching him about the deeper mysteries of the demigod world and how magic fits into it all.