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.
In 'Death Note Ryuk x Rem Fanfiction', a frequent theme is the contrast between their loyalties. Ryuk doesn't really have a strong loyalty to Light, he's just entertained by him. But Rem is extremely loyal to Misa. This contrast often leads to interesting scenarios where they either clash or come to some sort of understanding. Also, the theme of their different views on the power of the Death Note is common. Ryuk sees it as a source of amusement, while Rem is more cautious about its use due to her love for Misa.
One idea could be a story where Ryuk and Rem are forced to team up in the Shinigami realm to solve a mystery that threatens the balance between the human and Shinigami worlds. Another could be a fanfic exploring their relationship in an alternate universe where the rules of the Death Note world are slightly different.
One great place to start looking for Ryuk x Rem fanfiction is Archive of Our Own (AO3). There are many talented writers who create unique stories in this pairing. Some might focus on a scenario where Ryuk and Rem meet in an alternate Death Note universe. Another aspect could be how their different personalities - Ryuk's rather aloof and curious nature and Rem's loyalty and protectiveness - interact and develop a relationship in the fan - written stories.
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.
First, you should familiarize yourself with the characters of Ryuk and Rem from the Death Note series. Know their personalities, motives, and how they interact with other characters. Then, come up with an interesting premise, like what I mentioned before. For example, a situation that brings them together in an unexpected way.
In Death Note fanfiction, Ryuk and Rem have a rather complex relationship. Ryuk is more of an indifferent observer of the human world, while Rem has a deep emotional investment in Misa. Their interactions can be really interesting. Sometimes they might cross paths in the Shinigami realm or in relation to the actions of their respective human owners. Ryuk might find Rem's loyalty to Misa strange given his own non -chalant attitude towards Light. It's these differences that can create some really engaging scenarios in fanfiction.
Love and devotion are common themes. Fans often explore how deeply Rem loves Subaru and how Subaru might come to fully realize and reciprocate that love.
One common theme is the exploration of their relationship in different scenarios. For example, some fanfictions might focus on how they deal with the supernatural elements around them while being in love.
One common theme is the power dynamic. Ryuk has his own power as a Shinigami and Light has the Death Note, so their relationship in fanfiction often explores who has the upper hand. Another theme could be the concept of morality. Light's actions are often questioned, and Ryuk's role in either enabling or stopping him can be a big part of the story.
One common theme is the development of their relationship. It could be about how they gradually fall in love, especially considering Rem's deep affection for Subaru in the original series. Writers often explore the emotional journey between them.