Well, apart from Percy, Artemis is a must - have main character. She is the goddess of the Hunt, and her decisions and interactions with Percy will shape the story. There could also be some new characters created specifically for this fanfiction within the Hunt. They could be hunters who befriend Percy and help him adapt. And the wolf, which is mentioned in the title, could be a character with a backstory. Maybe it was once a demigod who was transformed into a wolf and now serves the Hunt. This wolf could act as Percy's guide and confidant throughout his time with the Hunt.
Obviously, Artemis. She is in charge of the Hunt, and her relationship with Percy would be central to the story. Then there could be Zoe Nightshade. She was a very important member of the Hunt in the original Percy Jackson lore. If Percy is adopted by the Hunt, she would have a big influence on him, either as a mentor or as someone who initially opposes his presence. And the wolf is also crucial. It could be a mysterious figure, maybe a messenger of the Hunt or a guardian of some sort, and it would be involved in Percy's journey every step of the way.
In a 'wolf percy jackson adopted by the hunt' fanfiction, it might start with Percy being alone and injured. The wolf, which could be a magical or sentient one, leads him to the Hunt. The Hunt, which is a group of strong female hunters, may initially be hesitant to take in a male like Percy. But as they get to know him and his skills, they realize he can be an asset. Percy would then have to adapt to their rules and code, which could lead to some interesting conflicts and character development.
Artemis is a must - as the goddess leading the Hunt. Her hunters, especially those like Phoebe, could be main characters. Phoebe could be curious about Percy and his blindness. She might be the one to first approach Percy when he's found. Another character could be Chiron. He could hear about Percy being with the Hunt and come to check on him. He could offer advice to both Percy and the Hunt, based on his vast knowledge of demigods. And then there's the Oracle. It could give some cryptic prophecy related to Percy's new situation with the Hunt, which would add an interesting layer to the story.
Obviously, Percy is one of the main characters since the title implies he's central to the story. The other main characters would likely be the leaders or prominent members of the Hunt. They would play important roles in Percy's adoption process and his subsequent life within the Hunt.
A powerful Titan who was once associated with the Hunt but turned against it. This Titan could be seeking revenge for being exiled from the Hunt in the past and wants to destroy it completely.
Artemis could be a major character. As the goddess associated with the Hunt, she would have a huge role. She might initially be skeptical of Percy's ability to protect the Hunt but gradually come to trust him. Thalia, who is part of the Hunt, would also be important. She has her own history with Percy and could be a key ally in the protection efforts.
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, obviously Percy Jackson is one of the main characters. Since it's about him being a slave of the Hunt, he's at the center of the story. Then there would likely be the Hunt's leader. This character would play a crucial role in dictating Percy's actions and his life within the Hunt.
There could be his friends or comrades in the hunt. For instance, someone like Annabeth who might be affected by his leaving and try to convince him to stay.
Grover could also be a major character. As Percy's best friend, he would probably be involved in trying to stop Percy if he thinks Percy has gone too far. Or, if he sees the corruption in Olympus, he may side with Percy. Grover's connection to nature means he could play an important role in the events that unfold, like using nature spirits to either protect Olympus or aid Percy depending on his stance.
Definitely the dragons would be key characters. There could be a powerful dragon queen who takes Percy under her wing, so to speak. She would be a very important figure in Percy's upbringing, teaching him the values and ways of the dragons. And there might be an outcast dragon, shunned by the others, but who bonds with Percy because they both feel like outsiders. Also, some of Percy's original friends from the demigod world, like Annabeth, might make an appearance. She could be initially confused and then intrigued by Percy's new dragon - influenced self.