Mouth Slitted Woman
Kuchisake Onna

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Kuchisake-onna (literally Mouth-Slitted Woman) is a recurring ghost of the Gakkou no Kaidan.
The most common version of he story in Japan, is that she was a woman who decided to have a plastic surgery, but the surgery went wrong, leaving her mouth torn, ear to ear.
She was originally going to was to be the ghost of the third episode of the Ghost Stories anime, but the episode was cancelled just days before it was scheduled to air, when many people complained to Fuji TV because they thought the facial feature looked like a cleft palette. A support group for people with such a disability met with management at Fuji TV. The episode was replaced for that airing with a hastily-prepared clip show. Only the preview remains.
It is unknown what Kuchisake-onnas mouth was to look like in Ghost Stories, viewers only get a pink flash of it in the 15 second promo. She did appear in the ending credits but due to the low quality its hard to tell what her mouth really looks like. It appears that she might have fangs or crooked or sharp teeth and that her mouth extends all the was from her lips to her ears. In the 1995 movie however her slit mouth resembles that more of the mouth of Kuchisake-onna depicted in the 2012 movie Kuchisake-onna Returns where her mouth and lips are fully torn off and she has extra rows of sharp and crooked teeth.