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.
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.
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.
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.
Yes, in some Death Note fanfiction, Harry Potter can be portrayed as a genius. Writers might combine his magical skills and intelligence from the Harry Potter universe and apply them in the context of the Death Note world, creating interesting and unique storylines.
There are many good ones. Some fanfictions expand on the backstories of the characters. For instance, there are stories about how Ryuk came to be the Shinigami he is. These can add a whole new layer of understanding to the Death Note universe. You should explore different tags and categories on platforms like AO3 to discover such great fanfictions.
A 'Naruto Death Note Crossover Fanfic' could be really interesting. Maybe Naruto somehow gets his hands on the Death Note. He might initially be confused by it, but his strong sense of justice could lead him to use it in a way to protect the Hidden Leaf Village from dangerous enemies. For example, he could use it to take out rogue ninjas who are planning mass destruction without having to engage in a long and dangerous battle.
In fanfiction, Sakura could be given the power of the Death Note. But instead of using it for evil like some in the Death Note story, she uses it to heal. She might find a way to transfer the 'death' aspect of the note into a 'healing' power, using her medical knowledge and chakra abilities.