An immortal Naruto in a Death Note fanfiction would probably start by trying to understand how the Death Note works. Since he doesn't have to worry about dying, he could get his hands on the Death Note and experiment. He might also try to protect the innocent people who are being targeted by the Death Note users. He could use his ninja skills like stealth and combat to take on the bad guys in this new and dangerous world.
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 first be extremely confused by the rules of the Death Note. His understanding of power and its consequences is rooted in his ninja training and his own moral compass. The Death Note's rules, which seem so simple yet so deadly, would be completely foreign to him. He would question why anyone would create such a thing and would be very hesitant to even consider using it, as it goes against everything he stands for in his world of ninjas, friendship, and protecting the innocent.
Well, Naruto's ninja skills and his strong sense of justice would likely clash with the concept of the Death Note. He might try to stop the use of the Death Note as it goes against his moral code of not taking lives unjustly.
If Naruto had the Death Note in fanfiction, it would be a total game - changer. He might struggle with the moral implications at first. Naruto is all about saving people and making friends, but if he saw how powerful the Death Note was in eliminating real threats to his village, like the Akatsuki members one by one, he might be tempted to use it. However, this would also put him at odds with his ninja way to some extent.
If Naruto found a Death Note fanfiction, he'd probably be really confused at first. He comes from a world of ninjas and chakra, and the concept of the Death Note is so different. He might try to understand how this strange 'book' in the story works, with its rules about writing names to cause death. But in the end, he'd probably just shrug it off as a really odd and dark story from another world's imagination.
His view on life and death would be challenged. In Naruto's world, he fights to protect life, but the Death Note's power to kill so easily might make him more cautious and serious about the value of life.
Yes, there are likely to be such fanfictions. The 'Harry Potter' and 'Death Note' universes are both very popular, and fans often like to combine different fictional worlds in fanfiction. They might create stories where Harry Potter gets his hands on a Death Note and all kinds of interesting and unexpected scenarios unfold as a result.