One character that would be interesting to include is Grover Underwood. His connection to nature and his role as a satyr could add an extra layer to the story. He could be the one who first senses something strange going on that leads Percy and the son of Dionysus on their adventure. Also, Mr. D (Dionysus in his Camp Half - Blood form) could be a key character. His grudging acceptance of Percy and his interactions with the son of Dionysus could create some humorous and tense moments. And don't forget about the other campers, like the children of Ares who could cause some trouble for Percy and the son of Dionysus.
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.
There could be a character who is a mentor to Percy in understanding his devilish side. This character might be an ancient being with knowledge of both the divine and the demonic. For example, a fallen angel who has seen the rise and fall of many with such mixed heritages.
There could be a new oracle who is specifically attuned to Percy's 'son of fate' situation. This oracle might be a young demigod with unique powers that help Percy understand his fate better. Maybe they can see visions of the future that are directly related to Percy's journey.
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.
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'.
Annabeth could be a strong ally. She has always been there for Percy, and even though his parentage has changed, her loyalty might still hold. Grover too. He's Percy's best friend and would likely stand by him no matter what. Another potential ally could be the Hunters of Artemis. Since Diana is another name for Artemis, they might see Percy as someone they need to protect and help, especially if he is involved in something that concerns the goddess.
Annabeth could be a great ally. She's smart and resourceful, and she could help Percy figure out the mysteries related to Sobek and his Egyptian connections. Her knowledge of architecture and strategy would be useful in any quests Percy undertakes.
There could be a powerful wizard from a far - off land. This wizard has knowledge of ancient magic that could help or hinder the Son of Neptune. Also, a group of dwarven - like creatures who are excellent craftsmen. They could create special weapons or tools for the Son of Neptune's journey. Additionally, an exiled god who sees the Son of Neptune as a means to regain his former glory.
One idea could be Percy having to go on a quest with the children of Dionysus. They could face a new type of monster that is immune to normal weapons but can be defeated by the power of wine, which the children of Dionysus can control. Another could be Percy getting into a friendly rivalry with a son of Dionysus over who can throw the best party at Camp Half - Blood. Maybe they compete to see who can get more demigods to attend their party, and in the process, they learn more about each other's powers.
The centaurs from Camp Half - Blood could be allies. They are wise and have a long history of helping demigods. Their knowledge of ancient prophecies and combat techniques could be useful to the Son of Artemis. Additionally, some of the minor gods' children might side with him. For example, the children of Hecate could use their magic to help him in difficult situations. They might see the Son of Artemis as a symbol of change in the demigod world and want to support that. Nico di Angelo, with his powers over the Underworld, could also be an ally. He could offer protection from the darker forces that might target the Son of Artemis.
Annabeth could be one of his allies. Even though Percy is now the 'Son of Eris', their long - standing friendship and her loyalty might make her stand by him. She could help him understand his new situation and use her wisdom to navigate the challenges that come with it.