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.
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, a great 'ryuk x reader fanfiction' often has good dialogue. Ryuk has a very distinct way of speaking, so getting that right can really bring the story to life. The fanfiction should also explore the power dynamics between Ryuk, with his Shinigami powers, and the reader, who is usually a normal human. This can create interesting conflicts and resolutions. Additionally, the emotions of the reader character need to be well - portrayed. Their fear, fascination, or even love (if the story goes that way) towards Ryuk should be written in a way that the reader can relate to.
A theme that often pops up is the idea of companionship in an unlikely duo. Despite their differences, in many fanfics, they develop a strange sort of bond. It could be a grudging respect or a more complex emotional connection. Also, the theme of fate is explored as they are intertwined in this strange situation due to the Death Note.
The key element is his boredom in the Shinigami realm which led him to drop the Death Note. Another is his lack of strong moral stance as he just watches the chaos caused by the Death Note in the human world.
Yes, there are some out there. You can start by looking on fanfic platforms like Archive of Our Own. Just search for 'Ryuk x Harry Potter' and you'll likely find a variety of stories with different takes on this unique crossover.
Common themes in Ryuk x Rem fanfiction include the discovery of new emotions. Since they are not exactly the emotional type in the original story, fanfiction writers like to explore how they would react to falling in love or developing a deep bond. Also, the theme of survival can come up. If they get involved in a situation where their lives as Shinigami are at risk, how they support each other through it can be a central theme in the stories.