Keukegen- Japanese folklore: a creature covered in black fur that lives in peoples houses. Its name means "rarely seen". It was a disease spirit, inflicting sickness into those who lived in its host house. It also reminds me vaguely of cookie monster.
'The Sailor Tokuso Encountering an Umibōzu' by Japanese printmaker Utagawa Kuniyoshi Ukiyo-e print. Umibōzu is a spirit in Japanese folklore. The Umibōzu is said to live in the ocean and capsize the ship of anyone who dares speak to it.