Yokai is a class of supernatural monsters in Japanese folklore. The word 'Yokai' made up the Kanji for "otherworldly" and "weird". Yokai range eclectically from the malevolent to the mischievous, or occasionally bring good fortune to those who encounter them. Often they posses animal features, other times they can appear as human, some look like inanimate objects and others have no discernible shape.
Hyakume, literally "one hundred eyes", is a Yokai that protects shrines from thieves. It is said that if you steal from a shrine then one of Hyakume's eyes will chase after you until it attaches itself to you.
Karakasa obake is a type of Tsukumogami, a folk legend about a form of Japanese spirit that originate from objects reaching their 100th year of existence, thus becoming animate. Karakasa in particular are spirits of umbrellas that reach century milestone. They are typically portrayed with eye, a long tongue protruding from an open mouth, and a single foot.
Isonade lives in the deep waters on the West of Japan. Every few months, Isonade will swim to the surface of the sea from the deep waters, to breath some fresh air. However, when he does this, storms erupt, oceans rage, and all ships will be swallowed by him as food.
Kanibouzu is a giant crab that hid in a temple and took the form of a buddhist monk. Whenever people visited the temple he would kill and eat them.
The first weasel knocked the unsuspecting victim down, the second cut the victim's flesh and the third applied medication to the wounds, so that at the time the victim realized what was happening they were left only with painful wounds that weren't bleeding. Sometimes, the three are described as brothers, sometimes as triplets.
Orochi has a huge, snake body up to 100 feet long, and a long serpentine tongue. He is powerful enough to crush trees with his tail and feeds on humans, The final blow comes from his tongue, which he uses to drain all the blood from his victim.
If you're out at midnight, the night sparrow will follow you while singing "Chin Chin." The appearance of a night sparrow is a prodigious sign that you will meet a wolf of stray dog soon. If you catch the night sparrow, you'll suffer from severe night-blindness.
Gasyadokuro are created from gathering bones from people who have died of starvation. Gasyadokuro is often fifteen times taller than an average person. If a Gashadokuro sees a human, it will grab it and bite its head off if it does not flee quickly. The only way a Gasyadokuro can be detected before it appears is by hearing a ringing in one's ears.