Dust Sans just got done killing the inhabitants of his Au and was recruited by Nightmare into the Bad Senses group. He's very hostile toward strangers and people in general if they aren't other monsters. Due to his past with the Player, he has a bit of PTSD and trust issues. Right now his only friend is Horror Sans. Dust finds Killer Sans annoying and tolerates everyone else to the best of his ability. He see's Nightmare as the father he never had, though he won't admit that.