They might also become more cunning. In a world full of danger and mythical beings, a reborn character could develop a sharp mind. They would need to outwit the gods and goddesses at times, or figure out how to solve complex riddles during quests, so they become more sly in their thinking.
His confidence would still be there but might be a bit more subdued as he adjusts to the new world. He's used to being a big shot among demigods, but in Hogwarts, he has to start from scratch.
His personality might become more reserved. As a Cullen, he'd have to fit into their more subdued lifestyle. He might lose some of his brashness.
When Percy is made a god in fanfiction, his personality could shift towards being more authoritative. He has to deal with other gods and manage his own domain. So he might become less impulsive as he now has more at stake. His kindness towards mortals could either increase as he has more power to protect them, or decrease as he becomes more involved in godly affairs. His confidence would likely soar, but it could also turn into arrogance if he's not careful.
If reborn into this fanfiction, your life would be full of new challenges. You'd be part of a community of demigods, which means there would be a whole set of rules and hierarchies to follow. You might start off as a nobody but through your actions on quests, you could become a hero. You'd also be constantly in danger from monsters sent by the gods who don't like you or your parent god.
His personality would likely experience a shift towards a more solemn and responsible demeanor. With godly powers come great responsibilities. Percy would no longer be able to act as carelessly as he did as a demigod. He might become more reserved in showing his emotions, especially as he realizes that his actions as a god can have far - reaching consequences. Also, his loyalty might be tested as he has to balance his new divine status with his relationships from his mortal days.
A haircut could make Percy seem more mature. If he goes from his typical shaggy look to a neat cut, it might symbolize a new phase in his life. For example, he could become more serious about his responsibilities as a demigod.
If Percy joins the Volturi in fanfiction, his personality could change in multiple ways. At first, he might be very resistant to their ways. But as time passes, he could become more like them in some aspects. He would be surrounded by vampires who are mainly concerned with power and control. This could make him more power - hungry. But also, Percy has a strong sense of justice. So, he might try to use the Volturi's power structure to enforce his own sense of right and wrong. This could lead to him being more authoritarian in his approach. He might also become more isolated as he can't fully trust the other Volturi members, which could make him more withdrawn and less likely to show his true emotions.
He might become more aloof. As a goddess, he'd be in a different social strata than before. He'd be more removed from the daily struggles of demigods and mortals, which could make him seem less approachable.
He might become more cautious. Since the future is unknown and full of new things, he would have to be careful. For instance, he can't just rush into a fight without knowing what his opponents are capable of.
Well, Percy's personality transformation would be complex if he becomes a wolf. He might become more in tune with the natural order. His sense of loyalty could intensify, much like how wolves are loyal to their pack. This could mean that he becomes even more protective of his friends, seeing them as part of his 'pack'. On the other hand, his communication style could change. Instead of relying on words, he might use more body language and growls to convey his feelings. And his relationship with authority might also shift. He could be more resistant to being ordered around, as wolves have their own hierarchy and he might see himself as an alpha in some situations. This new personality would add a whole new layer of depth to his character in the fanfiction.