Well, he might become more powerful and mysterious. Since Chaos is a very powerful and primordial entity, Percy would have to step up his game. He'd probably be more reserved, having to deal with the secrets and responsibilities that come with being the father of Chaos. His leadership skills would also be enhanced as he has to oversee something as big as Chaos.
In a 'Percy Jackson Father of Chaos' fanfiction, Percy's relationships would be in upheaval. His friendship with Grover would face a test. Grover, who has always been Percy's loyal friend, would now have to deal with a Percy who is unpredictable at times. Percy might accidentally cause chaos that affects Grover's nature - related tasks. With the other demigods at Camp Half - Blood, Percy would become a sort of enigma. Some would look up to him as a new kind of hero, while others would be jealous of his new - found power. His relationship with the sea gods, like Poseidon, would also change. Poseidon might be proud that his son has such a powerful new role, but also worried about how Percy will use his powers and how it will reflect on the sea god's domain.
Maybe it could be due to some powerful magic or a unique prophecy. In many fanfictions, unexpected events like this are often triggered by such elements.
Percy would likely become more powerful and confident. As the 'husband of chaos', he would be exposed to new levels of magic and strength. His decision - making skills would also be sharpened as he has to deal with the unpredictable nature of the chaos realm.
In this new role as king, Percy's relationship with the sea gods would become more complex. He's now in charge of a major part of their domain. Poseidon might have higher expectations of him and be more involved in his rule. Percy would also have to deal with other sea deities who might see his new position as a threat or an opportunity. His friendships with other demigods would be tested too. They might approach him with more respect but also expect more from him. Percy would need to balance all these relationships while also ruling Atlantis effectively.
In this fanfiction scenario, Percy's character change would be quite drastic. He would probably start to embrace the more chaotic and power - centric nature of the Titans. His relationships would be in turmoil. For example, his relationship with Annabeth would be severely tested. He might not value the same things he once did, like friendship and the protection of the camp. His new Titan - influenced self could be more self - serving, seeking to gain as much power as possible and not caring about the consequences for those around him. His values would be realigned with the Titans' more cut - throat approach to power and survival.
If Percy becomes influenced by Kronos in this fanfiction, his sense of morality would be greatly affected. He would probably lose his sense of right and wrong which was a big part of his character before. His loyalty towards Camp Half - Blood and his friends would be in jeopardy. He might start to think that the ends justify the means, which is a very Kronos - like way of thinking. And he could become more aggressive and less patient, as Kronos was always in a hurry to regain his power and rule over the world.
Percy becomes more powerful and confident. As the Brother of Chaos, he has access to greater powers, which changes his self - perception. He also becomes more independent as he's no longer just a demigod within the camp's structure.
Their relationship would likely become even deeper. They would be partners not only in their heroic adventures but also in parenting. They would have to support each other in raising their child, like Annabeth helping Percy understand their child's academic needs while Percy might be better at teaching combat skills. They would also have to make decisions together about their child's future, whether it's about staying at Camp Half - Blood or trying to live a more normal life in the mortal world.
The Blades of Chaos can make Percy more confident. Since they are such powerful weapons, having them gives Percy an edge in battles. He becomes more self - assured as he knows he has these amazing blades at his disposal. For example, when facing tough opponents, he stands taller and is more fearless.
Thanatos can add an element of danger and mystery. In slash fanfiction, he could be a catalyst for the relationship between two characters. For example, if Percy and another character are trying to stop Thanatos from doing something bad, the stress of the situation could bring them closer together. He also represents death, which is a powerful concept. His presence can create high - stakes situations that force characters to confront their feelings for each other.