Well, it could be about Percy having to adapt to his new divine family. Maybe he has to learn special water - related powers from Amphitrite that are different from what he already knows. He could also face challenges from other sea deities who are jealous of his new status.
The fanfiction could explore Percy's relationship with Amphitrite. Perhaps at first, Percy is hesitant to accept her as his new mother figure. But as time goes on, he starts to understand her love and care. Meanwhile, he has to deal with the politics in the underwater realm. There could be rivalries among different sea creatures and gods, and Percy has to use his wits and powers to keep the peace. He may also meet new friends and allies in the sea who help him on his journey.
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.
Perhaps the story could be about Percy facing discrimination from other demigods due to his new relation to Pluto. He is then forced to prove himself not only as a hero but also as a worthy adopted son of Pluto. He trains hard to master the powers and knowledge that come with his new status. He also tries to find a way to use his underworld - related abilities for the good of all demigods, like using his connection to the dead to get information about future threats to the demigod world.
Well, it could be about Percy's new powers he gets from being adopted by Hydros. Maybe he can control water in ways he never could before, like creating huge tidal waves at will. And he might have to face some new enemies who are after his new status.
Well, one possible plot could be that Percy, as the adopted son of Hermes, discovers new powers related to speed and trickery. He might use these powers to outwit the monsters that come after him. Maybe he gets involved in a quest where his Hermes - like abilities are crucial in stealing a powerful artifact from a well - guarded enemy stronghold.
Well, one possible plot could be Percy struggling to adapt to his new status as Apollo's adopted son. He might have to learn new powers related to the sun god. For example, he could start to have an affinity for healing, which is one of Apollo's main domains. And he would face challenges from other demigods who are jealous or suspicious of his newfound connection to a major god.
One possible plot could be Percy's struggle with his new identity as the adopted son of Zeus. He might face envy from other demigods who don't understand why he was chosen. He could also have to deal with Zeus' overbearing nature as he tries to train Percy in godly powers. And there would likely be new quests that involve both his ties to Poseidon and his new relation to Zeus.
Well, one possible plot could be Percy struggling to adapt to his new 'mother' Khione. He might have to deal with her cold and often unfeeling nature. For example, she could be trying to train him in her own ways which are very different from what he's used to at Camp Half - Blood. Maybe she wants him to use his powers in a more aggressive way to serve her own purposes.
Well, it could be about Percy having to deal with the powers and heritage that come with being the adopted son of Pontus. Maybe he discovers new underwater abilities that are different from his Poseidon - given powers. He might also have to face enemies who are after the secrets Pontus has.
One possible plot could be Percy discovering his true parentage as the son of Amphitrite. He might struggle with his identity, as he has always known Poseidon as his father. This could lead to a journey of self - discovery where he has to learn about Amphitrite's powers and how they are now a part of him.
One idea could be Percy having to learn about the unique powers and quirks of being associated with Dionysus. For example, he might have to deal with the power of manipulating plants in a new way, or understand the god's connection to madness in a more personal sense. Maybe he has to use his newfound 'family' connection to Dionysus to solve a mystery in the demigod world that involves some sort of curse related to wine or celebration.