Percy as the son of Oceanus might be more aloof. Since Oceanus is a primordial god, Percy could inherit a sense of distance from the more common demigod affairs. He might be more focused on the grander scale of the ocean's well - being rather than the day - to - day problems of the demigod camp.
On the other hand, Percy could be more powerful and confident. Knowing his heritage as the son of a powerful ocean deity would give him a boost in self - assurance. He would likely take on challenges with more bravado and be less hesitant in the face of danger compared to a demigod with a less prestigious parentage.
One plot could be Percy exploring his unique powers as the son of Oceanus. He might discover abilities that are different from the regular demigods. For example, he could have a special connection to the deeper parts of the ocean that no one else has.
There could be a power - hungry sea witch who wants to use Percy's connection to Oceanus for her own gain. If Percy refuses, she becomes an antagonist. Additionally, some of the more traditionalist sea tribes might view Percy as an outsider and try to drive him out, acting as antagonists in the story.
A possible plot could involve Percy being sent on a quest by Oceanus to retrieve a powerful artifact lost in the ocean. Along the way, he meets new sea creatures and forms alliances. He also has to deal with the fact that some sea beings don't trust him because he's an adopted son, not a true - born of Oceanus. This creates internal and external conflicts for him as he tries to prove himself worthy.
Percy as the son of Vulcan would likely be more analytical. In the original, he was quite impulsive. But now, with Vulcan's influence, he might think more before acting. For example, instead of immediately jumping into a fight, he would assess the situation and figure out the best way to use his new powers, like creating a strategic weapon on the spot. He could also be more introverted as he delves deeper into his new abilities and the mysteries of his new heritage. He may spend more time alone in Vulcan's forges, tinkering and thinking, rather than being out with his friends all the time.
One idea could be Percy exploring his new powers related to Oceanus. Since Oceanus is a primordial god of the ocean, Percy might have an even deeper connection to the sea and be able to control more extreme oceanic phenomena like underwater volcanoes. Another plot could involve Percy facing conflict within the demigod community as his new heritage changes the power dynamics. Some might fear his increased power, while others might want to use him for their own gains.
In this fanfiction, it's likely that Harry's life takes a very different turn. As the son of Oceanus, he could have an entirely different set of magical abilities. He might be able to communicate with sea creatures, control the tides, or even have a special bond with the underwater world. His story could explore how he balances his newfound powers and identity with his existing life as a wizard in the wizarding world. There could be a lot of self - discovery as he tries to understand what it means to be the son of such a powerful being.
His relationship with Annabeth would be different. She might be a bit more cautious at first, as Percy's new heritage from Oceanus could bring unforeseen challenges. But they would also have a new level of respect for Percy's increased power. With his other friends like Grover, they might look up to him more, seeing him as having an even greater destiny. However, some characters might be jealous or suspicious of Percy, like some of the children of Poseidon who might feel overshadowed.
Obviously, Harry Potter himself would be a main character. Since he's the son of Oceanus in this fanfiction. Hermione and Ron would probably still be important characters as his friends. They would be there to support Harry and also be involved in his adventures related to his new identity.
Percy's personality would probably be more solitary at first. Growing up with wolves, he's used to relying on himself and his pack. So when he enters the world of demigods, he might have trouble trusting others immediately. He'd be more in tune with his instincts, which could make him seem unpredictable to those who don't understand his background. For example, he might follow his nose or gut feeling more often than following the advice of others.
In addition to his water - based powers, Percy as the son of Hera and Poseidon could have enhanced leadership abilities. Hera is often associated with ruling and leadership. So, he might be able to inspire and lead groups more effectively. He could also have a stronger connection to the sky, as Hera has some associations with the heavens. This could give him the ability to control weather elements related to the sky, in addition to his control over water.