He could become more determined. If the fanfiction shows immortals achieving great things, Naruto may strive harder to achieve his own goals, thinking that if immortals can do it, so can he. Also, his sense of humor might come into play. He could be making jokes about the strange things in the fanfiction to his friends, but at the same time, be secretly thinking about how some of it could be useful.
Naruto might become more curious. Since he's reading about immortality, a concept quite different from his normal ninja life, he'll want to explore more about such ideas.
Reading the fanfiction could make Naruto more open - minded. He's used to the traditional ninja ways, but this fanfiction about immortality could expose him to new ways of thinking. He may start to question some of the long - held beliefs in the ninja world. For instance, if the fanfiction presents a different view on life and death compared to what he's been taught, he might have to reevaluate his own views. This could lead to some internal conflict at first, but in the long run, it could make him a more well - rounded and adaptable ninja.
His core Naruto - like personality of being determined and never - giving - up would still be there. But he might become more refined and elegant like the elves. He would probably have more patience due to the elven influence. His boisterousness might be toned down a bit, but he would still be the energetic Naruto at heart, just with a more elven - like exterior in terms of behavior.
Naruto's personality might become more calm and centered. Yoda could teach him to control his impulsiveness. So instead of rushing into things, he'd think more before acting.
Naruto might become more secretive. Growing up in the Snake Clan, which is often associated with secrecy and hidden motives, he could pick up on their ways of not revealing too much about himself or his plans. For instance, instead of being as open and brash as in the original series, he would be more guarded in his conversations.
Naruto's personality could change in several ways. He has always been determined, but now with the magma - related powers, he might become more assertive. He could also be more protective, seeing his new powers as a way to safeguard his friends and village even more. However, he might also face some inner struggles. The power of the Magu Magu no mi could make him feel different from his comrades, and he might have to deal with feelings of isolation at times.
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.
Well, it'd be a wild ride. Naruto's immortality would mean he could explore the Grand Line indefinitely. He could use his ninja skills to navigate the strange islands. Maybe he'd team up with the Straw Hats and share his unique abilities. His never - ending life could also lead to him uncovering ancient secrets in the One Piece world that others couldn't risk searching for.
The story would be crazy. Naruto's immortality in the Death Note fanfiction means he could potentially expose Kira's identity more easily. Since he doesn't have to worry about being killed by the Death Note, he could be more bold in his investigations. He might use his ninja skills to track down Light in ways that the normal characters in Death Note couldn't. And his never - ending energy and determination would surely put a lot of pressure on Light and his plans.
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.
If an OC is reincarnated in DxD fanfiction, their personality could be affected in various ways. They might become more assertive due to the dangerous environment. For example, having to face devils and angels constantly could make them more confident in standing up for themselves.