Percy is the main focus, as he has to navigate this new aspect of his identity as the son of Moros. But there could also be some antagonists that are main characters in their own right. For example, a demigod who is jealous of Percy's new - found status and power could be a main antagonist. Another character could be a minor god who is trying to use Percy for his own purposes. This god might seem friendly at first but then reveals his true motives. And let's not forget Percy's family. His mother, Sally Jackson, would still be an important character. She would be worried about her son and how this new development affects him. And Poseidon might also make an appearance, perhaps to have some sort of conversation or confrontation with Percy about his new parentage.
The main characters usually start with Percy. He's the one whose life is turned upside down by being the son of Moros. Then there are his friends from Camp Half - Blood. Nico di Angelo could be an important character as he has a lot of knowledge about the underworld and the gods related to it, and he could help Percy understand more about Moros. Thalia Grace might also be involved. She could be a bit skeptical about Percy's new identity at first but then come around to support him. And there could be some mysterious characters who are associated with Moros' cult or something similar. They might be trying to either recruit Percy or destroy him, depending on their own beliefs and goals.
Obviously, Percy Jackson is one of the main characters. He is the central figure around whom the idea of 'betrayal' revolves. The son of Kronos is also a key character, as the one who feels betrayed by Percy. Other common characters might include Annabeth, Percy's girlfriend. She could be involved in either trying to clear Percy's name or getting caught in the middle of the conflict between Percy and the son of Kronos.
One interesting plot could be Percy having to face a new set of monsters that are specifically related to Moros. For example, some kind of shadowy creatures that can predict his every move because of their connection to Moros' domain of doom. Another plot might involve Percy exploring his new powers as the son of Moros. He could discover abilities that are different from his Poseidon - related powers, like the power to see into the future in a very limited and dark way, which comes with its own set of challenges and moral dilemmas. And he may also have to deal with how other demigods and gods view him now that he is the son of Moros, facing both fear and respect from different parties.
Well, obviously Percy Jackson himself is often a main character. He's the hero of the original series, so in fanfiction related to Demeter, he usually plays a big role. Demeter is another main character, as the fanfiction is centered around her in some way. Sometimes her demigod children also make an appearance. For example, her daughter who might have some special powers related to plants or nature.
In some more creative fanfictions, new characters might be introduced. For example, a powerful demigod who was born in Tartarus and has unique abilities. These new characters can add a fresh twist to the story, interacting with Percy and the others in unexpected ways, and often bringing new plotlines related to the mysteries of Tartarus.
Well, obviously Percy himself is a main character. He's the son of Thanatos after all. His friends from Camp Half - Blood or wherever he hails from in the fanfiction are also likely to be main characters. They could include other demigods like Annabeth or Grover. And sometimes, Thanatos himself might make an appearance as a significant character, guiding or interfering in Percy's life depending on the plot.
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.
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.