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.
In a fanfiction where Naruto has the Death Note, things would get really interesting. Naruto could use it as a secret weapon. For example, he could write the names of the masked enemies he doesn't know the real identity of. And if he figures out their real names somehow, he can just jot them down. But this new power would also attract unwanted attention. Other powerful ninja might sense this strange and dark power Naruto has and either try to take it from him or view him as a threat to the ninja world's balance.
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 got the Death Note, it would be a complete chaos. Naruto has a strong sense of justice, but his understanding of it is very different from Light's in Death Note. He might initially be horrified by the power of the Death Note and try to destroy it. However, if he decided to use it, he could potentially target powerful enemies like Orochimaru or Pain without having to engage in direct combat. But this would also corrupt his ninja way as killing without a fair fight goes against his beliefs. He would likely struggle with the moral implications throughout the story.
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.
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.
Well, he could start judging the souls in the Naruto universe. Maybe he'd use his new powers to clean up all the evil ninjas in a very final way.
Misa would likely be excited. She is a big fan of Light and the whole 'Kira' concept. In fanfiction, if there are scenarios where she has more power or a closer relationship with Light, she would be all for it. However, she might also get jealous if there are other female characters getting too close to Light in the fanfictions.
The shinobi world's reaction would be complex. At first, there would be disbelief. Many would think it's some kind of new genjutsu or a hoax. But once they realize it's real, the more superstitious ninja would see it as a curse from the gods. The Hidden Sand Village might see it as a potential weapon against their enemies, while the Hidden Mist Village might be more cautious due to their history of bloodshed. The shinobi academies would start teaching about the Death Note as a new and dangerous threat. There would also be a black market for Death Note information, with some trying to sell false ways to protect against it.
In fanfiction, if Naruto were to open the gate of death, he might gain an extreme power boost. This could potentially allow him to defeat enemies that were previously unbeatable. However, it would likely come at a great cost, perhaps his own life or a part of his soul.
Ryuk would probably just be amused. He is a Shinigami who has seen a lot in his existence. Fanfiction is just another strange human creation to him. He might chuckle at some of the more outlandish ideas in the fanfictions, like a character having superpowers beyond the Death Note.