His personality could also become more complex. If he reads a lot of fanfic, he might start to internalize some of the emotions and traits that are often explored in those stories. He could develop a sense of wonder that wasn't as prominent before. And perhaps he'd start to question some of the norms in his own world. For instance, if a fanfic presents a different way of handling the vampire - human coexistence, he might think about whether the way they do things in the official Twilight story is really the best way.
He could become more self - aware. If the fanfic portrays him in a certain way, he might start to think about whether he really is like that. For example, if the fanfic shows him as being more heroic than he thinks he is, it could boost his confidence.
He could become more protective. Since Kiva's powers are powerful, Naruto might feel a greater sense of responsibility to protect his village and friends. He might also be more secretive about his new powers, at least until he fully understands them. And his sense of humor might change a bit, becoming a bit darker or more sarcastic as he gets used to his new identity as someone with Kiva - like abilities.
Naruto's personality might still shine through even as an Arrancar. He's always been determined and kind - hearted. However, he could become a bit more solitary at first as he adjusts to his new form and powers. The Arrancar nature might make him more cautious in some ways, but his basic values of friendship and protecting the weak would remain. He might also develop a bit of an edge, as Arrancars are often seen as more menacing, but it would be a surface change. Deep down, he'd still be the Naruto who wants to bring peace and joy to his village.
Yes, it is a bit surprising. Charlie is a rather practical character, and Twilight fanfiction is quite a departure from his usual interests. It's unexpected for someone like him, who is often involved in the more down - to - earth aspects of life in Forks, to be interested in this kind of fictional expansion of the Twilight world.
On the other hand, his abandonment could fuel his determination in a different way. He might be even more driven to prove himself, not just to the village that shunned him as an orphan, but also to himself. He could see his abandonment as a reason to show that he doesn't need anyone's pity or help, and become an even stronger ninja as a result.
Harry's personality would be greatly influenced. He would be more polished in his behavior, as Narcissa would demand propriety. He might be less likely to take risks without thinking, as Narcissa would have instilled in him a sense of caution. His sense of loyalty would be more complex. Instead of the straightforward loyalty he has in the original story, it could be divided between Narcissa's family values and his own sense of right and wrong. Also, he may have a more aristocratic air about him, with a refined way of speaking and interacting with others.
His personality could be split. On one hand, he would still have his core values of heroism and kindness. But on the other hand, the dark quirk could bring out a more ruthless side. He might find himself having internal debates between using his power in a traditional heroic way or succumbing to the darker impulses that the quirk brings. This internal struggle would be a major part of his new personality in the fanfiction.
Naruto's personality would be a complex mix. On one hand, he might become more reserved due to Vader's influence. But on the other hand, his natural inclination towards goodness might cause him to constantly struggle against Vader's darker teachings. He could be a much more conflicted individual, with his usually open - hearted and friendly personality warped by the dark environment he was raised in. He might be more secretive and less trusting of others as well.
Naruto might become a bit more confident and cocky. Shego is often shown as self - assured, and having her powers could make Naruto feel more powerful. He might start showing off a bit more during battles.
Naruto would likely be very conflicted. He is a person who values family deeply, so fighting his sister would go against his nature. This could make him seem more hesitant in the fight, constantly looking for a way to end it without hurting her too much.