Yes, there are quite a few. You can start by looking on popular fanfic platforms like Archive of Our Own. Some fanfics in this pairing explore their complex relationship, often delving into their personalities and how they interact in different scenarios within the Undertale AU universe.
The back story of Killer Sans varies depending on different fan interpretations. Some think he was exposed to immense evil that corrupted him, while others imagine a series of tragic events that drove him to embrace violence.
Yes, there are quite a few. You can check out some fanfiction platforms like Archive of Our Own. There you might find various stories exploring the relationship between Killer Sans and Nightmare Sans. Some might focus on their adventures together in the alternate universes of the Undertale fandom.
One common theme is power. Both characters are quite powerful in their own right, and fanfictions often explore how their powers interact. Another is the idea of redemption or the lack thereof. Since they are not exactly 'good' characters, some stories might play with the concept of them finding a way to be better. And of course, there's the theme of their relationship, be it a partnership, a rivalry, or something in between.
Well, in these fanfics, the combination of Nightmare Sans and Killer Sans allows for some really cool storylines. Their unique abilities and personalities can lead to intense battles, unexpected alliances, and deep emotional moments. Fans are drawn to seeing how these two interact and how their relationship can be developed in different ways. For example, some fanfics might show Killer Sans being influenced by Nightmare Sans in a way that changes his character arc, which is really fascinating to read.
One key element is the sense of despair. It's likely that he faced something that made him lose hope, which led to his violent ways. Another is the AU environment. If it was a harsh and unforgiving place, it could have pushed him to become a killer.
Well, Killer Sans' back story is rooted in a world that has been distorted in some way. He was likely faced with great despair or perhaps a sense of powerlessness that led him to this path of killing. In his story, he might have witnessed something so horrible that it changed his perception of the world and made him think that violence was the only way to deal with things. For example, he could have seen his friends and family being hurt, and that pushed him over the edge.
At first, Sans would probably be a bit shocked, but then he'd turn on his laid - back, sarcastic attitude. He might make jokes at Gaster's expense, which could either annoy Gaster or make him respect Sans more. If Gaster tries to harm him, Sans could use his shortcuts to dodge attacks and try to find a way to reverse the situation. He'd also likely be thinking about how this affects his friends in the Underground, especially Papyrus, and try to find a way back to them.
Often, they interact with a lot of patience. They sense the reader's pain and are gentle. For example, they might start by just being a quiet presence around the reader. They slowly build trust, like in a story where a Sans from an AU offers the reader a small gift as a sign of friendship without pushing too hard.
Papyrus might be initially shocked. He's used to Sans being more laid - back, so seeing him in a fight could be quite a surprise. His eyes would widen and he might gasp.