A common theme is friendship. Their relationship is often explored in depth, showing how they rely on each other. For example, in many fanfics, mob looks up to reigen for guidance.
There's also 'The Unspoken Connection' which is really good. It focuses on the unspoken understanding between mob and reigen. The author does a wonderful job of portraying their unique dynamic.
Well, one characteristic is the blend of different universes. Since sans and reigen are from different fictional worlds, fanfics often play with the idea of how these two very different worlds collide. For example, in some, the magic or powers from each world interact in unique ways.
One popular sans x reigen fanfic is 'Crossed Realms'. It weaves an interesting story where the two characters from different universes interact in unexpected ways. It has great character development and a unique plotline.
Love and unrequited love are common themes. Since mob has feelings for tsubomi, many fanfics explore how he deals with those emotions. Another theme could be growth, like how mob's relationship with tsubomi affects his personal development.
One interesting dimple x reigen fanfiction could be about them going on a supernatural adventure together. Maybe Dimple uses his ghostly powers to help Reigen out of a tricky situation in a haunted house, and in the process, they develop a deeper understanding of each other.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and you can easily search for dimple x reigen ones using the search bar. Just type in the relevant tags and browse through the results.
In a great 'mob boss tom x harry fanfic', the characters need to be well - written. Tom should have the traits of a mob boss, like being authoritative and having a certain ruthlessness, while Harry could be more innocent or naive at first. And the story should have a good pacing, not too rushed when it comes to their relationship development. For example, it might start with Harry being scared of Tom but then slowly growing to understand and care for him. There should also be some sort of conflict, either external threats to their relationship or internal struggles within themselves about their feelings for each other.
A popular 'mob boss tom x harry fanfic' is 'Shadows of the Mob'. It focuses on how Harry, an ordinary guy, gets involved with Tom, the mob boss. The story has a great plot with lots of twists and turns as their relationship evolves, from suspicion to a deep - seated bond.