He may also develop a more nocturnal lifestyle, which would change his perspective on the world. The night, which was once a time of rest, would now be a time of activity for him. This shift in his daily routine could lead to him interacting with different people and getting involved in different situations. He might meet other nocturnal creatures and form new relationships that are based on his new vampire identity.
His character would likely become more solitary at first. Vampires are often associated with a certain aloofness, and Percy might find it hard to relate to his old friends in the same way. For instance, he may start to avoid social gatherings during the day because of his new sensitivity to sunlight.
Another idea is that Percy discovers he has a long - lost vampire heritage. As he becomes a vampire, he starts to unlock memories and powers related to his vampire lineage. He could go on a journey to find out more about his vampire ancestors and the secrets they held, all while adjusting to his new vampiric existence which is full of both challenges and newfound abilities.
Percy's diet would be a major change. Instead of his normal diet at Camp Half - Blood, he would have to feed on blood. This could lead to some really interesting moral dilemmas in the fanfiction. Does he feed on humans? If not, how does he get the blood he needs? Maybe he tries to find a way to survive on animal blood, like some vampires in other stories do.
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.
His relationship with Sakura would be very different. Instead of the old friendship/romantic tension, Sakura might be initially afraid of him as a vampire. She would have to overcome her fear and see that Naruto is still the same person inside. His relationship with Sasuke could also be strained. Sasuke might see Naruto's transformation as a sign of weakness or a new threat.
His character might become more aloof. As a primordial god, he would be far removed from the normal world of demigods. He'd likely have a different perspective on things like friendship and loyalty. For example, he might not be as quick to jump into a fight for his friends as he used to be, because his new status would bring a different set of responsibilities.
If Percy becomes a vampire, his relationships would change drastically. His friends from Camp Half - Blood might be afraid of him or try to find a way to 'cure' him. His relationship with Annabeth would be put to the test. She might be determined to save him, but also conflicted because of what he has become. And Percy himself would have to deal with the fact that he now belongs to a different 'species' so to speak.
His confidence would likely soar. As a god, he'd know he has more power and capabilities. So he might be more assertive in his actions and decisions.
Percy might become more brooding. As a vampire, he's now part of a world that's often associated with darkness and mystery. He may also become more possessive, which is a common trait among vampires. For example, he could be overly protective of his territory or the people he cares about.
His character would likely become more hardened. The military life is tough and Percy would have to face a lot of difficult situations. He might become less trusting at first as he'd be in a new environment full of strangers. But over time, he could learn to rely on his new comrades. Also, his sense of responsibility would expand from just protecting his friends and family to protecting his entire unit and his country in the context of the fanfiction.