In this fanfiction, a great plot could be Percy being sent on a quest by Ares that seems to go against his moral code. He has to decide whether to follow his new - found father's orders or stay true to his own beliefs. Meanwhile, he's also trying to understand the history of his mother's relationship with Ares. Maybe there are secrets there that could change his whole perspective on his family. Along the way, he meets other demigods who are also related to Ares in different ways, and he has to figure out how to interact with them.
Well, perhaps Percy discovers his heritage during a battle. He starts having these strange impulses related to war and combat that he can't explain. As he uncovers the truth, he has to deal with the fact that his friends might view him differently now. He also might be dragged into Ares' schemes and has to find a way to balance his old loyalties with this new family connection.
One idea could be Percy struggling to fit into Ares' violent and war - like family culture. He's used to Poseidon's more fluid and adaptable ways. Another could be Percy having to face off against his new - found siblings in a sparring match to prove his worth to Ares.
A really cool plot could be Percy getting caught in an alternate dimension where Ares is the main god in charge. He has to find a way to survive in this new world, where the rules are different and he's seen as an outcast. Percy would need to use his wits and skills to navigate this strange place and find a way back home.
A possible plot could be a competition among the demigods where Percy, as a 'Son of Ares' in this fanfiction, has to prove himself against other powerful demigods. The competition could include tasks like combat, strategy, and survival challenges. Along the way, Percy could learn more about the Ares - like qualities within himself and also form new alliances or rivalries.
The traditional Greek monsters would still be antagonists. For example, the Minotaur could be a threat as Percy tries to come to terms with his new identity. It might target him specifically because of his new connection to Ares.
A plot could involve Ares testing Percy in a series of challenges that are not just about physical strength but also about his mental and moral fortitude. For example, Ares creates illusions of Percy's friends in danger, and Percy has to make difficult decisions. This would explore Percy's character deeper and also show a different side of Ares as a sort of cruel mentor. Or perhaps a story where Percy is accidentally transported to Ares' domain during a battle, and he has to find a way to escape while also dealing with the war - crazed creatures there.
One plot idea could be Percy having to team up with the children of Ares for a special quest. Maybe there's a powerful ancient weapon that only the combined strength of Poseidon's and Ares' descendants can wield. Another idea is Percy getting caught in the middle of a feud between the Ares cabin and another cabin, and he has to find a way to make peace. Or perhaps Percy discovers he has some unexpected connection to Ares' lineage that changes his perception of himself and his powers.
One idea could be Percy struggling to fit into Ares' violent and war - loving family. He might constantly have to prove himself in battles or challenges set by Ares. Another could be Percy having to deal with the other children of Ares being jealous of the attention he gets from their father. He could also be on a mission to redeem Ares' bad reputation among the demigods using his own unique skills and the powers he inherits from Ares.
Maybe Percy discovers that his being a son of Ares was part of a grander scheme by the gods. Like, the gods were using him as a pawn to either start or stop a war between the different godly factions. This would completely change his view of himself and his place in the world. He might have to decide whether to go along with the gods' plans or forge his own path, which could lead to some really intense and emotional storylines.
One idea could be Percy struggling with the duality of his parents' natures. Ares' aggression and Aphrodite's love and beauty aspects could be at odds within him. For example, he might be in a situation where his natural inclination towards love and peace from Aphrodite clashes with the need for battle and aggression from Ares during a war between the camps. Another plot could involve Percy having unique powers due to his dual heritage. Maybe he can use love as a weapon in a way, like making enemies fall in love with each other and thus incapacitating them, which is a strange power coming from the combination of his parents.
Perhaps there's a mystery at Ares High School where strange things keep happening, like students getting sudden bursts of uncontrollable strength. Percy, suspecting it has something to do with Ares, investigates and discovers an ancient artifact hidden on campus that's causing the chaos. He then has to find a way to stop it without getting caught by the school authorities or Ares' minions.
One idea could be Percy having to struggle with the dark reputation that comes with being Lucifer's son while trying to prove he's not all bad. Maybe he forms an unlikely alliance with some angels who initially distrust him but later see his good side.