Dust Sans, referred to as Dust, is a Sans from the Dusttale AU, and a member of the Bad Sanses, led by Nightmare. 

Dust is a extremely introverted, and incredibly psychotic individual. He suffered a great deal of pain, and is known to be obsessive towards killing the player. However, he is more unable to cope, rather than purely emotionless. He’s also potentially schizophrenic, having sudden outbursts. He is in good standing with his friends in the Bad Sanses. 