Yokai176 pages of Yokai. A class of supernatural entities and spirits in Japanese folklore. The word ykai is composed of the kanji for attractive; calamity and apparition; mystery; suspicious. Ykai are also referred to as ayakashi, mononoke or mamono. Yokai are not literally demons in the Western sense of the word, but are instead spirits and entities, whose behavior can range from malevolent or mischievous to friendly, fortuitous, or helpful to humans.