The ao andon is the incarnation of mass human terror, formed out of the built up fears of large groups of people. This fear takes the appearance of a demonic woman with long black hair, blue skin, blackened teeth, sharp claws, and horns. It wears a white or blue kimono, and glows with an eerie blue light.
Meyer, Matthew. The Night Parade of One Hundred Demons: A Field Guide to Japanese Yokai