One interesting character to include would be a half - blood from the Ares cabin who has the power to control fire, named Ember. She could be both a friend and a rival to Percy. There could also be a centaur who is a bit of an outcast from the main centaur group and teams up with Percy. His unique perspective and skills could be very useful. And then there's Rachel Elizabeth Dare. Her ability to see through the Mist and her non - half - blood status could bring a fresh dynamic to the story, especially when it comes to Percy's new situation as the 'Son of Ares'.
A satyr who has a special connection to the minor god. He could be like Grover, but instead of being dedicated to Pan, he's dedicated to this minor god. He could help Percy understand the ways of the minor god and provide some comic relief as well.
There is definitely some out there. A lot of fanfiction writers like to explore unique pairings and family relationships in the Percy Jackson universe. Some might be more action - packed, while others could be more about the emotional journey of Percy as the son of Ares and Artemis. You might have to dig a bit through the search results to find the really great ones though.
One common theme is identity. Percy has to figure out who he is with such an unusual parentage. Another is power. With Ares and Artemis as his parents, he might have unique powers that are explored in the stories. Also, there's often the theme of acceptance among his peers in the demigod world.
Annabeth Chase would be a great character to include. She is smart and can help Percy with strategizing in difficult situations. Her knowledge of architecture and ancient history can come in handy when they are exploring new places in the ocean world.
Well, of course, you have to include Percy Jackson himself. Then, there could be a son of Dionysus, like Pollux. He could be a fun character to include as he already has his own experiences and relationships within the Camp Half - Blood. Chiron, the centaur mentor, would also be a great addition. He could offer wisdom and guidance to Percy and the son of Dionysus during their adventures. Another character could be Annabeth Chase. Her strategic mind could come in handy when they are facing difficult situations in the fanfiction.
One of the most interesting characters to include would be Hermione from Harry Potter. Her intelligence and knowledge of magic could help Percy and his friends in many situations. Also, Captain America from the Avengers. His leadership and sense of justice would blend well with Percy's own heroic nature. And Clary from the Mortal Instruments, her skills as a shadowhunter and Percy's demigod abilities could create a really engaging story.
In fanfiction, the relationship could be developed by exploring their family ties. Since Percy is a demigod and Ares is a god, there could be some underlying connection through the divine family tree. Maybe they discover that they are related in a more distant way than they thought. This could lead to Ares having a more protective side towards Percy, or Percy seeing Ares in a less antagonistic light. Also, they could be forced into a situation where they have to communicate their feelings and motives clearly, like being trapped in a magical prison together. This would make them open up and start to build a more complex relationship.
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.
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.