Another interesting character could be a half - sister or half - brother of Percy who is also the child of a minor god. They could have different powers and a different perspective on being a demigod. They might start off as rivals to Percy but then become allies as they face a common threat.
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.
Perhaps Percy discovers that he has some latent powers related to being the son of a minor god that he didn't know about before. This could lead to him having to train in a whole new way, with a mentor who is an expert on that particular minor god. He might face challenges from other demigods who are jealous of his new - found abilities.
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'.
His friends from Camp Half - Blood like Annabeth could be his allies. Annabeth is smart and strategic, and she would be able to offer valuable advice as Percy goes through the process of becoming a minor god.
A new character could be a half - angel, half - mortal who becomes Percy's ally or rival. They have powers related to both the Christian concept of angels and the Greek demigod powers. Another could be a seer from an ancient, long - forgotten civilization who has knowledge about Percy's true potential as a son of god.
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.
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, perhaps the plot could involve Percy having to prove himself worthy of becoming a minor god. He might have to complete a series of difficult quests that test his courage, loyalty, and wisdom, which are the traits highly valued in the world of the gods.
How about a character named Riven? He is a young boy who was abandoned near a river and was adopted by the river spirits. He has the power to communicate with fish and other river creatures. Riven is initially very distrustful of Percy because he sees Percy as an outsider. But as they get to know each other, they become friends and Riven helps Percy understand some of the more hidden aspects of the rivers, like the places where the rivers' memories are stored.
Definitely Thalia. Since she has a history with Percy and is a part of the Hunters of Artemis, she could bring a lot of drama and interesting interactions. Another character could be Reyna. Her strong - willed and leadership - like nature would make her a great addition to the group. And of course, some of the lesser - known hunters could be included, like Zoe Nightshade. Her backstory and her relationship with Artemis could add depth to the fanfiction.
A character could be a young oracle who has visions related to Percy's new adventures. She could be a bit of an enigma, not fully understanding her own powers and sometimes giving cryptic messages that Percy has to decipher. This would add an element of mystery to the story.