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.
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.
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.
Harry would likely be very conflicted. He has seen a lot of death and has always fought against dark magic. The Death Note's power to kill just by writing a name is something that goes against his values. He would probably try to keep it away from others and might even consider destroying it.
Characters like Near might analyze the fanfiction. He'd probably look at the logic behind the plotlines in the fan - made stories and compare them to the real events in the Death Note world. If the fanfiction has a really convoluted and illogical plot, he might dismiss it as being not worthy of his attention. But if it has an interesting take on the characters' motives, he might give it more thought.
It's quite simple. You can use apps specifically designed for adding voice notes. Just search for them in your app store and follow the instructions to attach the voice note to your story.
Heiress match makers are mainly concerned with worldly matters like wealth, status, and compatibility when making matches. Celebrity ghost stories are from a different sphere entirely. They may react with amusement or disbelief if they come across such stories. Since their job is to create matches based on tangible qualities, they would not factor in something as intangible as a ghost story. Even if a celebrity is associated with a well - known ghost story, the match maker would still be more interested in the celebrity's real - life assets and character traits for the purpose of matchmaking.