Think about an AU where sans ends up as the narrator, like how Chara is. Just imagine. Because it could be great or horrible.

On pacifist, it would be great, because he would have his own opinions on each character and tHE DAMN PUNS HE WOULD USE EVERY DAMN OPPORTUNITY IM TALKIN WORSE THAN THR NARRATION IS ALREADY

But then on genocide, iT'S GUILT TRIP CITY.

he would make you feel so bad for what you've done.