There might also be other demigods. In the Percy Jackson universe, there are many demigods, and some of them could be involved. They could be friends or foes of Percy. Additionally, mythical creatures that are associated with the Olympian realm, like centaurs or satyrs, could be main characters as well. They could help or hinder Percy in his adventures as an Olympian.
Well, Percy is obviously one of the main characters since the title mentions him. Other likely characters could be the Olympian gods and goddesses. For example, Zeus, Poseidon, and Athena are important figures in Greek mythology and would probably play significant roles in a story set in the Olympian world.
Percy's friends from his previous adventures might also make appearances. Characters like Annabeth, Grover, etc. might be there to support Percy or get involved in his new life as an Olympian. Their relationships with Percy could evolve in different ways in this fanfiction context.
Another possibility is that there could be a narrator, perhaps a minor Roman god or a demigod who has some connection to both pantheons. This narrator could be the one guiding the story of the Roman gods reading and their reactions, adding their own insights and interpretations along the way.
Probably other demigods would interact with Percy. Maybe some demigods who are in need of a more stable influence in their lives would seek out Percy. Also, characters like Grover might find Percy in Hestia's care and there would be a reunion. And the gods and goddesses who are associated with the concept of home or family in Greek mythology, like Demeter, could also have interactions with Percy.
Definitely Annabeth. She and Percy have a strong relationship, and Hera's possessiveness would surely disrupt that. Also, other demigods at Camp Half - Blood could interact with Percy. They might sense that something is off with Percy due to Hera's actions and try to help him or at least figure out what's going on. And of course, the gods themselves might interact with Percy. Some gods might side with Hera, while others might oppose her possessiveness over a demigod like Percy.
Obviously, Percy and Poseidon will be main characters. Percy, as the son of Poseidon, is the one on the receiving end of the punishment. Poseidon, being the god of the sea, is the one dishing out the punishment. There might also be other characters like Annabeth, Percy's girlfriend. She could play a role in trying to help Percy understand why he is being punished and how to get out of the situation.
Obviously, Percy and Gaea would be the main characters. But there could also be other characters like Annabeth. She might be heartbroken at first when she hears about Percy's marriage to Gaea. And then there could be some of the other demigods like Jason or Piper who would be involved in trying to understand what's going on and maybe even stop it if they think it's a bad thing.
Obviously, Percy would be the central character. His friends like Annabeth, Grover, and other demigods from Camp Half - Blood might also be important. They could be trying to help Percy or might be affected by his insanity. For instance, Annabeth might be desperately searching for a way to bring Percy back to his senses.
Obviously, Percy will be one of the main characters. Annabeth might also be there, as she often gets involved in Percy's adventures. Grover could be another, as he is Percy's friend and might be there to help Percy deal with the situation of being mistaken for a god. Maybe even some of the gods from the Percy Jackson universe could show up, either to clarify the mistake or to take advantage of it.
Percy Jackson himself would obviously be a main character since it's a 'Reborn Percy Jackson Fanfiction'. His friends like Annabeth Chase are also likely to be main characters. She could play a crucial role in helping Percy adjust to his new life after being reborn. Grover would probably be there too, still being Percy's loyal friend. And the gods, especially those who have a connection to Percy like Poseidon, would also be important characters as they might have different reactions to Percy's rebirth.
Obviously, Percy is one of the main characters as he is the one being tortured. The hunters as a group are also main characters. Among the hunters, there might be a leader or a few individuals who are more prominent in the act of torturing Percy. There could also be some of Percy's friends or allies who might try to rescue him, like Annabeth. They could be secondary characters who play important roles in the plot.
Obviously, Percy will be the main character. He is the one doing the destroying after all.