Bad Sanses

Dust Sans

his left pupil is cyan encircled by red and the right one is only red he is careless, psychotic, and obsessed with killing the human doing whatever it takes to stop them. Despite being extremely careless, Sans does seem to regret killing Papyrus

Killer Sans

he is very thoughtful but not to the point of feelings, he hates being belittled or compared especially to other Sanses he wears Dull/Darkened blue jacket with a fluffy hood (often depicted as having a black stain on the chest), black turtleneck, shorts with inverted colors, shoes instead of slippers (sometimes with no laces or untied ones)

Horror Sans

is very unpredictable and unstable due to his psychosis from his injuries, he can be very comedic one moment laughing at some dark humor, to cutting someone's ear off brutally in seconds, yet he's shows to be very intelligent and easily cunning and manipulative he wears a blue jacket, black shorts with white stripes, a white shirt and instead of slippers, blue tennis shoes. His shirt also appears to be stained with blood, his jacket is a different tone of blue and the hood now has fur