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.
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.
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.
Percy might also have an ability to sense emotions on a deeper level. This could help him in combat, as he could predict an opponent's moves based on their emotional state. For instance, if an enemy is angry, he might be more reckless, and Percy could use that to his advantage.
His powers would be a blend of two very different deities. While still having control over water like the original Percy, he might be able to use his Aphrodite - related powers in combat. For example, he could use his charm to disorient opponents or make them more vulnerable. Also, his connection to the sea might be different. Instead of just controlling the water, he could perhaps make the sea seem more alluring or beautiful, which could be a new form of defense or attack, luring enemies into a false sense of security.
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.
Canon Percy has powers related to water as Poseidon's son. If he were Artemis' son in fanfiction, his powers would likely be more lunar - based. He might be able to control moonlight, for example. He could use it to blind enemies or create illusions. Also, instead of being able to breathe underwater, he could perhaps run at super - fast speeds like the hunters do.
Since Leto has her own history and experiences, Percy could become more empathetic towards the Titans. This newfound empathy could make him more diplomatic in his interactions with others. He might also become more of a loner, as Leto's adopted son, exploring the world on his own terms and trying to understand his new identity. This would shape his personality in a way that is both different from his original self and yet still retains some of his core traits like his sense of humor and determination.
His powers would likely be much more elemental. Since Ouranos is associated with the sky, he might have powers over the air, such as creating powerful winds or even controlling the weather on a greater scale than before. And from Gaea, he could have enhanced earth - based powers like causing massive earthquakes or having a deeper connection to the land, perhaps being able to communicate with all forms of plant and animal life that are rooted in the earth.
In this fanfiction, Percy would likely have powers related to both Apollo and Athena. Canon Percy has water - based powers from Poseidon. But here, he might have the ability to heal like Apollo, which would be a huge difference. He could also have enhanced intelligence and strategic thinking from Athena. So instead of just relying on his strength and water powers in battles, he could use his wits and healing abilities as well.
If Percy is the brother of Artemis and Apollo, his personality might be more refined. Since Artemis is associated with grace and Apollo with beauty and culture, Percy could be more sophisticated in his mannerisms compared to the original Percy. He might be more attuned to the arts and have a deeper sense of propriety.