One reason could be the exploration of new relationships within the established fandom. Fans like to see how these two characters, who have their own identities in the 'underfell' universe, interact in a romantic and often yaoi - themed way. It allows for creativity in storytelling, like how they overcome differences or how their relationship develops in a world full of challenges. Also, the yaoi aspect appeals to those who enjoy male - male relationship stories, adding a new dimension to the existing lore of the 'underfell' world.
Searching for 'underfell sans x grillby yaoi fanfiction' can be an interesting adventure. You can start by looking at Tumblr. There are often fanfic writers who post their works there. Additionally, some Discord servers dedicated to the relevant fandom might also be a good place to look. Just be aware that the quality and content can vary greatly, so it might take some time to find something that suits your taste.
One common theme is friendship. Despite their different natures, Sans and Grillby can be shown developing a deep bond. Another theme is the contrast between their personalities. Sans is often more laid - back and Grillby is more reserved, and exploring that contrast can make for interesting stories.
Well, I'm not sure about specific ones off - hand. But you could also check out some Undertale fanfiction forums. Sometimes fans share their favorite 'underfell sans x grillby' stories in those communities. They might even have reviews or summaries to help you decide which ones to read.
The characters themselves are very appealing. Sasuke is the brooding and powerful avenger, while Itachi is the mysterious and tragic figure. In yaoi fanfiction, their personalities can be explored in new ways, especially in terms of their emotional and physical connection. It allows fans to see a different side of their relationship that isn't fully explored in the original anime or manga.
In the 'yuma x astral yaoi fanfiction', fans are drawn to the idea of exploring uncharted territories of their relationship. In the original, their connection might be more platonic or focused on other aspects. But in yaoi fanfiction, writers can delve deep into their feelings, create romantic tension, and show a side of their relationship that might not be as obvious in the original. This gives fans a chance to experience a new side of the characters they love, with all the passion and drama that yaoi can bring. It also allows for a great deal of creativity as writers can take the basic elements of the characters and build a whole new world of emotions and interactions around them.
One reason could be the unique dynamic between Oga and Furuichi. Their relationship in the original work might have some elements that fans find interesting to explore in a yaoi context, such as their friendship or the way they interact with each other.
The contrast between the two characters. Underswap Sans is more laid - back and friendly compared to Underfell Sans who is more rough and edgy. When they interact in fanfictions, it creates a lot of interesting dynamics, like how they might clash or gradually understand each other.
The fan base loves these characters so much that seeing them interact in new and unexpected ways is always a treat. The relationship between them can be explored in so many different ways, from friendship to rivalry. And the unique art styles and interpretations that often come with these fanfictions add to the overall appeal. There are also some really emotional stories that can be told about them finding common ground or learning from each other, which really tugs at the heartstrings of the readers.
Characterization is key. A good fanfic should accurately portray the personalities of both Underswap Sans and Underfell Sans. Their unique traits, like Underswap Sans' more positive and friendly nature compared to Underfell Sans' tougher exterior, should be well - presented.
The popularity might also stem from the fact that Naruto has a huge fan base. With so many fans, there are bound to be those who are interested in exploring different pairings in a yaoi context. Kiba and Akamaru have their own charm and personalities in the series, and fans like to build on that in fanfiction. They can add new storylines and emotions that weren't fully explored in the original anime or manga. For example, exploring how their relationship could develop in different scenarios or how they might deal with new challenges together in a more romantic or intimate way.