Hanako-san is a legendary Japanese ghost who is said to haunt school bathrooms. She is often used as a cautionary tale to discourage children from misbehaving or wandering alone at school. While Hanako-san is a specific name for this ghostly figure, there are other synonyms used to describe similar spirits in Japanese folklore. Some of these include Kuchisake-onna, a woman with a slit mouth who is sometimes seen in school bathrooms; Aka Manto, a mysterious figure who asks bathroom visitors if they want a red or blue cloak; and Teke Teke, a woman who lost her legs and now haunts railway tracks. Each of these characters carries their own unique stories and warnings for those who encounter them.