Her power development could be different in that she might be more attuned to the hidden and mysterious parts of the sea. Percy is great at using the sea for obvious things like creating waves for attacks or traveling. But she could be able to unlock secrets of the deep sea, like finding lost treasures or ancient magic that has been dormant for ages. She might also have a different way of controlling water currents. Instead of Percy's more brute - force approach, she could be more delicate and precise, like using water currents to weave a protective barrier or to guide small sea - creatures to safety. This would set her apart from Percy and give her a unique power set in the fanfic world.
He would likely be more cautious and distrustful. Since he's being raised by a monster, he may not have the same sense of heroism and justice that the normal Percy has. He might see the world as a more dangerous place where only the strong survive.
His powers could develop in a very unique way. Since he has the blood of Chaos, his powers might start off as small, random bursts of energy. For example, he might accidentally create small pockets of chaotic space. As he learns to control his Poseidon powers, like controlling water, he could start to merge the two. He might be able to make the water act in chaotic ways, like creating whirlpools that have unpredictable movements.
In a fanfiction where Percy is the son of Hades and Poseidon, his powers would be truly extraordinary. He could have the ability to create portals in water that lead to the Underworld. This would give him an advantage in both battle and travel. His hydrokinesis could be tainted with the essence of death, so when he attacks with water, it could cause a draining effect on his opponents, sapping their life force. Additionally, he might be able to sense the presence of the dead in any water source, which could be used for both reconnaissance and protection.
Percy has his water - based powers from Poseidon. In contrast, as Hestia's daughter, she would have powers related to fire and the hearth. Her powers would be more about warmth, protection, and stability. While Percy can control the seas and use water for offense and defense, she could use fire to purify, heal, and create barriers. For example, she might be able to heal wounds by applying a warm, gentle fire. Her powers would be less about brute force like Percy's in battles but more about maintaining balance and harmony, like her mother's role in the pantheon.
Percy would likely be more in tune with the concept of home and family. Since Hestia represents the hearth, Percy might be more nurturing and protective. He could develop a stronger sense of responsibility for the well - being of his friends as if they were his family.
Percy would likely be more brooding. Since Iapetus was often seen as a rather serious figure in mythology, Percy might inherit some of that solemnity. He could be more withdrawn, thinking deeply about his new identity.
Well, at first, they might be cautious around each other. Percy is used to being the main hero, and the daughter of Zeus's sudden appearance could make him a bit jealous or at least wary. But as they face challenges together, they start to respect each other. Maybe she saves Percy from a difficult situation, and he realizes she's not just there to steal his thunder. Over time, they could become good friends, relying on each other's unique skills in battles against monsters.
Percy would likely become more devious. Growing up with Loki as an adoptive father, he'd be exposed to Loki's tricks and lies. So instead of his straightforward, if sometimes impulsive, nature in the original Percy Jackson stories, he might think more about the different angles of a situation before acting.
She could potentially have the power of regeneration. Kronos was a powerful being, and if she inherits some of that essence, she might be able to heal from wounds faster than normal demigods. This would make her a very tough opponent in combat as she could keep coming back even after taking serious hits.
Well, in the original Percy Jackson stories, Percy has powers mainly related to water as the son of Poseidon. But in this fanfiction with Hestia as his mother too, he might have an added connection to fire or the concept of home. So, he could potentially have the ability to control the temperature of water, like making it boil or freeze instantly, which combines his water powers with a bit of the hearth - related powers. He might also be able to create a sort of protective shield around himself and his friends that has the properties of both the ocean's strength and the warmth and safety of the hearth.