So, I made 2 AUs, one that's WarTale. Or Beforetale
Remember in the beginning of the game, they tell us a story,
ANd in that story, humans and monsters broke into war?
Well that's where the AU is.
Chara and Asriel died around the same age they died in Undertale,
Only difference is that, they just walked in, and while trying to kill Asriel, Chara jumped in front of him to protect him, then Asriel died crying for Chara.

Since then, the war stopped, but wasn't over,
They made a wall to divide themselves,
But somehow, a kid always managed to get in.
Same goes for frisk.

Pacifist: if Frisk was able to make peace with them, and found ways to bring peace for both races

Genocide: if Frisk decided to kill them all secretly (maybe like the imposter in among us)

In my AU,
Frisk and Chara= Kiawe and Amy