Killer Sans killed everyone in his timeline and even betrayed Chara countless times. He now works for Nightmare, doing anything he asks of, and lives in the Nightmare castle. Rumor has it that he killed his Frisk and doesn't feel remorse. He normally bets things with Horror, Killer, Dust, and sometimes Nightmare. Enjoys knives and chocolate and cats, doesn't know how to cook, rarely sleeps and eats, he has two white cats. he is constantly crying a black liquid which seems to be his determination