Killer: Has knife magic, has Sans' magic, is Sans, has Chara in his soul, wears a dark blue jacket, white and black shorts, blue shoes, crazy

Horror: Has Sans' magic without Blasters, uses blades, has one red eye in his left socket, is Sans, wears a dark blue jacket, black and white shorts, blue shoes, a cracked hole in his skull, unpredictable

Dust: Is Sans, has Sans' magic, wears Sans' clothes covered in Monster dust, has his hood up, hallucinates Papyrus

They work for Nightmare