One idea could be a story where Fell Sans and Fell Toriel form an unlikely alliance. Maybe they start by just having chance encounters in the Underground, and over time, they realize they share a common goal, like trying to bring some sense of order to the chaotic Underfell world. This could involve them working together to deal with unruly monsters and gradually growing to respect each other.
To write a great Undertale Underfell Sans x Fell Toriel fanfiction, you need to research the Underfell universe thoroughly. Know the rules, the power dynamics, and the overall atmosphere. When it comes to their relationship, start with small moments. Maybe Fell Sans brings Fell Toriel a small gift, like a flower from the dangerous parts of the Underground. This simple act can start to break the ice between them. As for the writing style, use vivid descriptions to bring the Underfell setting to life. Describe the dark corridors and the menacing monsters in the background as their relationship unfolds.
Frisk would be a likely candidate. Since Frisk is the main character in Undertale and has a very adaptable personality. They could approach Underfell Sans with an open mind and try to understand him.
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.
In such a fanfiction, there could be a lot of conflict. Underfell Sans is from a more hostile AU than Undertale. He might initially be distrustful when meeting the characters from Undertale. For example, he could misunderstand their kindness as weakness or a trick.
One common theme is the clash of different lifestyles. Hipster Sans has his laid - back, hipster - like ways while Gamer Fell is more into the intense gaming world. Their interactions often revolve around getting used to each other's lifestyles.
There's 'Sans - Bound'. This fanfiction focuses on the challenges they face when they are forced to work together. It's not just about their relationship but also about the world - building in the undertale and underfell universes. The descriptions of the settings are vivid and add to the overall charm of the story.
There's also 'Sibling Rivalry Reimagined' which delves deep into how their personalities from their respective universes interact. It has some really interesting character development for both Sanses. It shows how their differences can lead to both conflict and unexpected understanding. The author does a great job of portraying their emotions and the way they communicate, which is quite different from the original game's interactions.
One aspect to consider in 'classic sans x fell sans fanfiction' could be the character development. Classic Sans is often depicted as more laid - back while Fell Sans has a harsher edge. Their interaction in the fanfiction might lead to interesting changes in their personalities. For example, Fell Sans could learn to be more relaxed through his encounters with Classic Sans, or Classic Sans could become more assertive in the face of Fell Sans's aggression. Another point is the plot. It could revolve around a common threat that forces them to work together, despite their differences. This could create a lot of tension and drama as they have to overcome their initial distrust of each other.
The appeal lies in the fact that these two characters represent different aspects of the same basic concept. Fans are drawn to seeing how they can coexist or clash. Additionally, the fanfiction community around them has created a whole range of stories that range from heart - warming to action - packed, which gives readers a lot of variety to choose from.
One idea could be that the OC human is a lost traveler in the Underground. Toriel discovers the human and decides to take them under her wing. The fanfiction could focus on the relationship that develops between them as Toriel teaches the human about the Underground's ways and they share heart - to - heart conversations.