In this fanfiction, Naruto might learn some new and unique jutsu from the Shinigami. The Shinigami could be a powerful entity that tests Naruto's resolve and strength.
It would probably be the Shinigami. Since it's a mysterious and powerful being from another realm, its motives and actions would be really interesting to follow.
One aspect that could be explored in such fanfictions is the idea of dependence. Light depends on Ryuk for the use of the Death Note, at least in terms of understanding its full capabilities. Ryuk, on the other hand, depends on Light for entertainment. This mutual need could be the basis for a deeper, more emotional connection in the context of yaoi fanfiction, where feelings of love or at least a strong bond could develop in unexpected ways.
Well, perhaps Harry stumbles upon Snape's family in an unexpected place like an old family manor. Maybe he discovers Snape has a long - lost sister who has powers similar to Snape's but has been hidden away for some reason.
One great 'ryuk x reader fanfiction' is 'A Meeting with Ryuk' which delves into an interesting encounter between the reader and Ryuk. It has a unique take on his character and how he interacts with the reader.
It could be about Naruto somehow getting the power of Ryuk. Maybe he finds the Death Note in his ninja world and has to deal with the moral implications of using it, like Light did in Death Note.
Ryuk is a Shinigami, and his stories would likely be centered around the themes related to death and the power of the Death Note. He may tell stories about how different people reacted when they first got hold of the Death Note. Some were greedy and tried to use it for personal gain, while others were more hesitant. He could also share stories about the Shinigami who have come before him and the unique situations they were involved in. Ryuk has a very different perspective from humans, so his stories would offer a strange and often disturbing view of the world, filled with moral dilemmas and the consequences of playing with the power of life and death.
Well, in some fanfictions, the Shinigami might save Naruto by using its special powers to reverse a fatal curse or injury. For example, it could extract a harmful entity that was about to kill Naruto from his body.
Maybe the Shinigami uses its special powers to heal Naruto's severe injuries. For example, it could transfer some of its own spiritual energy to Naruto to revive his fading life force.