Well, one possibility is that there would be a lot of confusion. Frisk, being the kind-hearted protagonist, might try to reason with Error. Chara, on the other hand, could be more unpredictable. Error might see them as glitches in the fabric of his world - or whatever strange view he has. Maybe he'd try to destroy them at first, but Frisk's determination could change his mind.
It's hard to say exactly what would occur. Frisk might be curious about Error and his powers, trying to understand him. Chara could be jealous of Error's power and try to manipulate the situation. Error could be annoyed by their presence and try to get rid of them. However, the beauty of fanfiction is that it can take many different directions, depending on the writer's creativity.
Well, Frisk could be cautious at first. Since Chara in Underswap is different, Frisk might be on guard. However, as they get to know each other, they could become friends. For example, they might share stories about their friends in their respective worlds. Frisk could talk about Sans and Papyrus, while Underswap Chara could talk about their own versions of the characters. Eventually, they could team up to face some challenges in the Underswap world.
Frisk and Chara have a complex relationship already in Undertale. When Error enters the picture, it gets even more interesting. Frisk might be the mediator between Chara and Error. Chara could be hostile towards Error initially, seeing him as a threat to their own existence or plans. Error would likely be dismissive of both of them at first, thinking they are just insignificant parts of a world he might want to destroy.
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.
Some fanfictions focus on the relationship between Frisk and Chara in a more emotional way. For example, Chara might be haunted by their past actions, and Frisk tries to help them come to terms with it. It shows how their bond can be both complex and heart - warming, as they support each other through difficult times.
One interesting fanfic could be 'A Shared Soul'. It delves deep into how Frisk and Chara's relationship develops in a post - pacifist world. It shows how they understand each other on a deeper level and face new challenges together.
Another way is to ask in undertale - related forums or communities. There are many fans who are into reading and writing fanfiction, and they can recommend some great stories. They might even have their own collections or bookmarks of good frisk and chara fanfictions that they can share with you.
Well, it could be really interesting. Maybe it shows a unique interaction between Chara from Storyshift and Sans from Undertale. Their personalities are quite different. Chara can be rather complex and Sans is known for his laid - back yet perceptive nature. So in the fanfiction, there might be a lot of unexpected exchanges and development of their relationship.
The plot might center around Frisk's sense of justice. In Undertale, Frisk often makes choices based on what they believe is right. In the BATIM world, they could see the wrongdoings and try to fix them. When they meet Bendy, Bendy could be a source of mystery. Frisk would try to understand Bendy's nature. It could also be that Frisk's ability to reset in Undertale has some sort of strange effect in the BATIM world, leading to all kinds of unexpected twists and turns in the story.
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.
Well, one possibility is that Dream could use his positive energy to heal Frisk. Since Dream is often depicted as a benevolent character, he might sense Frisk's pain and offer some sort of magical assistance. Maybe he has special powers that can soothe Frisk's wounds and give them the strength to continue on their journey.