Yōkai are a class of supernatural entities and spirits in Japanese folklore. The kanji representation of the word yōkai comprises two characters that both mean "suspicious, doubtful", and while the Japanese name is simply the Japanese transliteration or pronunciation of the Chinese term yaoguai, some Japanese commentators argue that the word yōkai has taken on multiple different meanings particular to a Japanese context, including referring to a large number of uniquely Japanese creatures. From Wikipedia
