Annabeth Chase would probably also be an important character. She has always been Percy's close friend and in this fanfiction, she might play a role in helping Percy understand and control his new powers related to the void. She could be the voice of reason when Percy is tempted by the darker aspects of his new identity.
There could also be new characters created specifically for this fanfiction. Maybe there is an old sage or a mysterious being who has some knowledge about the void and Percy's connection to it. This character could act as a guide or a source of conflict for Percy as he tries to figure out his place in this new world of being the son of void.
There could be new characters introduced. Maybe a being from the void itself, a sort of anti - hero or a misunderstood creature that Percy has to work with. Also, some of the old Gods like Poseidon might play a role. Poseidon could be either worried about his son's new status or trying to use it to his advantage in the complex politics of the Gods.
Obviously, Percy Jackson himself. And probably his friends like Annabeth. There might also be new characters unique to the void, like strange creatures or spirits that inhabit that place.
The main character is Percy Jackson. Alongside him, we may have some characters that are exclusive to the fanfiction world. For example, there could be a character who is a half - human half - stone being as a result of Medusa's powers in the past. This character could be an ally or an enemy to Percy. Then there's a good chance that Chiron, the centaur trainer at Camp Half - Blood, will be in the story. He's always been a guiding figure for Percy, and in this new context, he'll have to give Percy advice on how to handle his new identity as the 'Son of Medusa'.
Obviously, Percy Jackson is one of the main characters. He's the central figure around which the story usually revolves.
Percy Jackson is definitely a main character. He's the one at the center of the 'son of chaos' concept. Then there are his friends from Camp Half - Blood like Annabeth. She might be involved in trying to understand Percy's new situation or helping him in his new adventures. Grover could also be there, being Percy's loyal friend as always.
The main characters would be Percy Jackson, who has to deal with the implications of being the son of Cerberus. Then there's Cerberus, whose relationship with Percy is the central concept. Chiron, the centaur at Camp Half - Blood, would also be important as he's always been a guide for Percy. And don't forget about the other demigods at the camp. They would react to Percy's new identity in different ways, some with suspicion, some with curiosity, and their reactions would be part of the story.
Obviously, Percy Jackson is the main character. But there could also be Annabeth Chase, his long - time friend and love interest. Grover, his satyr friend, might also play an important role. And since it's related to the Fates, the three Fates themselves - Clotho, Lachesis, and Atropos - could make appearances, either as allies or antagonists depending on the story.
Another important character could be Chiron. He, as the centaur mentor, plays a crucial role in guiding Percy. He might be the one to first discover Percy's ice powers and then help him understand the implications of being the Son of Ice. There could also be villains, such as a dark wizard who wants to steal Percy's ice powers for his own evil purposes.
In addition to Percy, there could be new characters created specifically for this fanfiction. Maybe a dragon trainer or someone from an ancient dragon - associated clan. They could guide Percy in his journey of self - discovery regarding his dragon heritage. And of course, we can't forget the villains. There might be some dark demigods or creatures that oppose Percy because of his newfound powers.
Obviously, Percy Jackson is one of the main characters. Since it's about him being the son of Metis, he would be central to the story. Then there might be other demigods like Annabeth who could be involved, perhaps helping Percy on his journey related to his mother.