Hanako is a well-known Japanese urban legend about a ghost who haunts toilets, particularly in elementary schools. According to the legend, if you knock on the third stall of a girls' toilet and say "Hanako-san, are you there?" (Hanako-san, imasu ka?), a ghostly voice will respond, "Yes, I'm here" (Hai, imasu). If you then open the stall door, you'll find a small, girl-like ghost.
If you then open the partition, you'll supposedly find a girl in a red or pink kimono. Depending on the version, if you ask her to let you out, she might, but there's often a catch or a consequence, like death.
Master of the Master Sword (the sword that seals darkness), the Hylian Shield, and the Triforce of Courage.