Who are the likely characters to be watching Sans fight in the 'Undertale characters watch Sans fight' fanfiction?

One interesting thing could be the different reactions of the characters. For example, some might be in awe of Sans' combat skills, while others could be worried about the outcome. They might cheer him on or try to interfere depending on their relationships with Sans.

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.

In the fanfiction, a character might also react with confusion. Sans' attacks and his overall fighting style can be very unique and hard to understand. A character who is used to more straightforward combat might be completely bewildered by Sans' moves, not knowing how to counter or even react properly.

A heroic type of character might see the Sans fight as a great challenge. They would be eager to face him and prove their worth. They might respect Sans as a worthy opponent and try to fight him honorably.

From Undertale, characters like Sans or Frisk could be main characters too. Sans, with his laid - back yet intelligent nature, could provide a great contrast to Error Sans. And Frisk, being the human with the ability to reset and change the course of events, would be crucial in any plot involving the two different universes colliding.

Well, in this fanfiction, it might show different perspectives of various characters seeing Sans fight. It could be really interesting to see how different characters react to Sans' combat style, whether it's his unique attacks or his strategic moves during the fight.

Flowey can also be a great character in these fanfictions. His complex and often conflicted personality, from his initial malevolence to his potential for growth, is explored in depth. Writers can really dig into his backstory and how it has shaped him, especially in relation to Sans. In some fanfictions, Flowey's interactions with Sans become a catalyst for his character development.

One interesting 'sans fight fanfiction' story could be about an alternate universe where Sans has different powers during the fight. For example, he might be able to manipulate time in a more extreme way than in the original game.

Alphys could be another common character. As the royal scientist, she might be called upon to figure out what's wrong with Sans. She could bring her scientific knowledge to the table, trying to diagnose and find a cure. Her own insecurities might play a role here too, as she might be worried about failing to help Sans.

You can try websites like Archive of Our Own (AO3). It has a large collection of fanfiction, and you can search specifically for 'sans fight fanfiction' there. Just use the search bar and type in the relevant keywords.