A class of preternatural creatures in Japanese folklore. Since many copyrights have elements based on mythology, only use this tag for classical depictions of the youkai. An anime girl that is stated to be a youkai and only has barely noticeable connections to said youkai does not get this tag, unless the youkai is humanoid to begin with.
Notable characteristics are: humans (transformed), shapeshifters, animals, ogres, and even inanimate objects.
