Obviously, Percy Jackson himself. Since it's about him being the son of Amphitrite. Also, Amphitrite is likely to be a main character, as she is his mother. Other characters could include his friends from Camp Half - Blood, like Annabeth, who might have to deal with Percy's new identity and the changes it brings.
Percy is the central figure, of course. But we may also see Triton, Amphitrite's son in the original mythology. He could be a complex character in the fanfiction, perhaps having a conflicted relationship with Percy. And then there are the sea nymphs and other minor sea deities that might be involved, either as allies or antagonists depending on the story.
The main characters would definitely include Percy. Then, there could be characters from the underwater court. For example, the mermaids and mermen who serve Amphitrite. They could play important roles in helping Percy understand his new heritage and powers. And let's not forget Poseidon. Even though Percy is now seen as the son of Amphitrite, Poseidon's influence might still be present, and their relationship could be explored in the fanfiction.
Percy Jackson himself is often involved. He might encounter the wolf in the woods around Camp Half - Blood and have to figure out if it's a friend or foe. Another common character is Annabeth. She could use her wisdom to analyze the significance of the wolf in the context of the Percy Jackson lore.
Percy Jackson himself is often the main character. He has a connection to the sea, and in pet fanfiction, he might find a sea - related pet like a hippocampus that he befriends and trains. Annabeth Chase could also be involved. She's smart and might use her knowledge to help with any problems the pet causes or gets into.
Obviously, Percy Jackson himself is often the central character in such fanfictions. His friends like Annabeth Chase can also be involved. In some cases, she might be the one trying to keep Percy out of trouble or, on the contrary, joining him in his 'delinquent' adventures. Grover could also be there, perhaps reluctantly getting dragged into Percy's misadventures.
In these types of fanfictions, Nico di Angelo could play a significant role. Given his connection to the underworld, he might be involved in trying to either retrieve Percy's soul or deal with the after - effects of his death. Also, Luke Castellan's spirit could make an appearance, maybe taunting Percy in his final moments or having some role in the events leading up to his death.
Some of the traditional sea monsters like the Kraken could be antagonists. Since Percy is now in a more prominent position in the sea world as Amphitrite's adopted son, the Kraken might see him as a threat and try to attack him.
Chiron, the centaur trainer at Camp Half - Blood, is often included. He has a vast knowledge of the gods and their ways, so he can guide Percy through understanding the nature of his blessings. He can also help Percy train to control any new powers that come with the blessings. Additionally, some fanfictions might include new or minor characters who are either the cause of the blessings or are affected by Percy's new - found status after being blessed by the gods.
The gods also play important roles. Zeus, as the king of the gods, might be worried about Percy's newfound power over time and how it could affect the balance of power in Olympus. Hades could be involved too, as time can have implications for the underworld. For example, if time is messed up, souls might not be able to pass on properly. Athena could be another key character, using her wisdom to figure out how to deal with the time - related situations that Percy is involved in.
Percy is the central figure, of course. But in many fanfictions, Aphrodite herself plays an important role. She could be the one setting the trap, or she might have a more complex relationship with Percy where she's both the antagonist and a potential ally in breaking the trap. Grover could also be involved, using his nature - related powers to help Percy in some way.
Percy Jackson himself is often a main character. Since it's related to his world, he might be the one to encounter ichor in a new and unexpected way. Maybe he discovers a source of ichor that has some strange effects on him or his powers.
Percy Jackson himself is often a central character in such fanfics. Since he's the main protagonist of the original series, it's natural for him to be involved in hypnosis - related plots. Annabeth Chase also frequently appears, as she has a close relationship with Percy and would be involved in trying to help or understand him during a hypnotic state.