I really like the fanfic 'UnderSwap Encounter'. It starts with an interesting encounter between Underswap Sans and Chara. It shows how their initial differences lead to a series of events that gradually bring them closer together. The author does a wonderful job of creating a vivid setting for their story.
There's a fanfic titled 'Chara and Sans: The Unlikely Pair'. This one is quite engaging as it focuses on the challenges they face while trying to understand each other. It also has some really heart - warming moments as they slowly form a connection, and the plot twists keep you hooked till the end.
One great 'Underswap Sans x Chara' fanfiction is 'A Different Bond'. It delves deep into their relationship, exploring how their personalities interact in a unique UnderSwap universe. The story has a great balance of action and character development.
One great Underswap Sans x Reader fanfiction is 'A Swap in Fate'. It has a really engaging plot where the reader character is transported to the Underswap universe and forms a unique bond with Sans. The author does a wonderful job of portraying Sans' personality in this AU.
There's also 'Swap Brothers' Bond'. This fanfic delves deep into the brotherly bond between Sans and Papyrus in the Underswap setting. It shows their daily adventures and how they support each other. The author does a great job of capturing the essence of their swapped selves, and it's full of humorous and touching scenes.
The popularity of 'Underswap Sans x Chara' fanfictions lies in the unique character combinations. Underswap Sans has his own distinct personality, and when paired with the complex character of Chara, it creates an interesting dynamic that fans love to explore.
Another scenario could be that there's immediate conflict. Sans might suspect that this different - looking Chara has some malicious intent towards his world or his friends. So he could start a fight right away. But as the encounter progresses, they might start to understand each other better and the fight could turn into a more of a philosophical debate about the nature of their respective worlds and the actions they've taken in the past.
Underswap Chara could develop a sense of respect for Sans. Sans is known for his power and intelligence in the Undertale world. Through their interactions, Chara might see that there are different ways of handling situations than what they're used to in their own world. They could learn from Sans' more laid - back approach and start to adopt some of his non -chalant attitude towards things. This could lead to a more mellow version of Chara in the fanfiction.
One great idea for a fanfiction could be a story where Underswap Sans and Underswap Papyrus go on an adventure in the Underground. Maybe they encounter a strange new monster that no one has ever seen before. They have to use their unique abilities to figure out how to deal with this new threat.
Another theme is friendship or partnership. They often come together to face challenges in the Underground. For example, in many fanfictions, they join forces to defeat a powerful monster or solve a mystery that threatens their world. This theme of unity despite their differences is really appealing.
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.
A plotline could be that they discover a hidden part of the Underground. This new area could have different rules and strange creatures. They have to adapt quickly to survive and also figure out how this new place relates to the rest of the Underground.
In some fanfictions, sans is often depicted as laid - back and sarcastic, while chara can be shown as complex and mysterious. Their relationship might be one of mutual understanding, especially if the story delves into the deeper lore of the game world they come from.