Would never stab anyone: Pisces, Pinkamena, Eyeless Jack, Virgo (Psst.... they will dissect you instead)

Would stab as retaliation: Aquarius, Homicidal Liu, Taurus, Ticci-Toby

Would yell "I won't hesitate!" First: Masky, Gemini, Libra, Jane The Killer, Sagittarius, Laughing Jack

Would stab without warning: Aries, Jeff The Killer, Scorpio, Nina The Killer

Would stab as a warning: Cancer, Clockwork, Capricorn, KageKao

Would take a stab to end internal suffering: Leo and Leo alone.