Papyrus is another beloved character. His big - hearted but sometimes naive nature in Undertale, his more intimidating form in Underfell, and his altered personality in Underswap can lead to humorous and heartwarming interactions. His relationships with other characters, especially Sans, are always fun to explore in these crossover fanfictions.
Frisk is also quite popular. Their role as the main character in Undertale and how they would interact with the darker or different versions of characters in Underfell and the swapped - up world of Underswap makes for great fanfiction material. They can be the mediator or the catalyst for change in the crossover story.
Sans is often a very popular character in these fanfictions. In both Undertale and Underfell, he has a distinct personality. In Underfell, his more edgy and somewhat darker side can create interesting interactions when combined with the regular Undertale Sans.
One interesting plotline could be the clash of different character personalities. For example, the more aggressive characters from Underfell interacting with the kinder ones from Undertale. They might start off not getting along but gradually learn from each other.
Sans from Undertale and his Underswap counterpart are often a popular pairing. People like to explore how the two different versions of him interact, given their different personalities. Another popular one is Papyrus from Undertale and his Underswap version. They can have some really funny exchanges.
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.
Chara is often a popular character. Their complex nature makes them interesting to explore in the context of Storyshift. They can be portrayed in different ways, sometimes more sympathetic than in the original Undertale.
Twilight Sparkle from MLP is often a popular choice. Her intelligence and powerful magic make her a great character to interact with the complex world of Undertale. In Undertale characters, Sans is also quite popular in these crossovers. His laid - back but mysterious nature can create interesting dynamics when paired with the ponies.
Well, in a 'underfell sans meets underswap fanfiction', it might involve a clash of cultures, so to speak. Underfell Sans is from a darker, more dangerous world where survival is tough. When he meets the Underswap characters, who are often more laid - back and kind - hearted, it could lead to some really cool storylines. For example, he could learn about friendship in a new way from the Underswap Sans, or get into trouble while trying to adapt to their more peaceful world.
Definitely Sans and Papyrus from Undertale. Sans' cool and mysterious personality along with his time - related abilities can create some really exciting storylines when combined with the Overtale universe. Papyrus, on the other hand, with his big heart and somewhat naive nature, can bring a lot of humor and heartwarming moments. From Overtale, the more heroic - type characters are popular. They can show off their skills and values when interacting with the morally complex characters of Undertale.
It's a fan - made concept where the worlds or characters of Underswap and Undertale interact. It often features unique storylines that combine the different character traits and settings from both.
One possible plot twist could be that Underfell Sans turns out to be a long - lost relative of one of the Underswap characters. Another could be that a villain from Underfell follows him to the Underswap world and causes chaos. Or perhaps Underfell Sans is actually there to steal something important from the Underswap world but has a change of heart halfway through.