Hyakki Yagyō
In the Hyakki Yagyō Emaki (held by the Matsui Library), they are depicted under the name of kurobō (黒坊). They have the same appearance as the "nuribotoke" of the emakimono and e-sugoroku, with both eyes out of their eyesockets. In this emaki, the korobō appears as the very first of the yōkai.