This enemy is, in part at least, based on the kuchisake-onna ("slit-mouthed woman"), a figure appearing in Japanese ghost stories, possibly dating back to the Edo period. She is a woman who was mutilated by her husband, and returns as a malicious spirit.
According to the legend, she walks around wearing a surgical mask. The woman will ask a potential victim: "Am I pretty?" If they answer no, she will kill them with a pair of scissors, which she carries. If they answers yes, she will pull away the mask, revealing that her mouth is slit from ear to ear, and ask: "How about now?" If they answer no, she will cut her victim in half. If the person answers yes, then she will slit their mouth like hers. It is impossible to run away from her, as she will simply reappear in front of the victim.
Miss Murder is a stealthy and bloodthirsty killer who has the ability to move between dimensions. The wicked demon will suddenly tear through the fabric of reality, a cold chuckle the only warning, and use its large hedge-clippers to violently clip an unsuspecting victim. If not destroyed, Miss Murder will simply mend its portal and soon reappear elsewhere.