Yokai are “strange apparition”, a class of supernatural entities and spirits in Japanese folklore. Their behaviour can range from malevolent or mischievous to friendly, fortuitous, or helpful to humans.
These beings often have animal features but may also appear humanoid in appearance. Others resemble inanimate objects or have no discernible shape.
Typically they’re described as having spiritual or supernatural abilities and act according to their own set of laws, rules and ceremonial rituals.
Many Yokai are driven with a sense of purpose and have their own ideas of morality, ethics and principles separate from humans. As a result, they may use their abilities to achieve goals that are harmful or beneficial to humans.