Kuchisake-onna (“Slit-Mouthed Woman”)
Wearing a surgical mask, the Kuchisake-onna approaches children and asks them if they think she is beautiful. If they say no, she kills them with her scissors. If they say yes, she removes the mask and says, “How about now?” If they still say yes, she will slit their mouths like her.
The way to escape her is to tell her she is only so-so, it will confuse her and give the victim time to escape.