Region of origin: Japan
Hungry spirits who were condemed to roam the earth and feed on corpses, using their claws to dig up the recently interred. They are aware of and lament their ghoulish behavior, and in some stories they only take on their monstrous forms at night or while feeding, but cannot resist the hunger that possesses them. In life they were people not evil enough to be wholly condemned to hell but so full of greed their spirit could not pass on properly.
In unrelated news, I do happen to have this Patreon now.
Originally posted on Tumblr on April 12, 2016