Abura-Sumashi is a yōkai from Japanese folklore, specifically tied to the mountain passes of Amakusa in Kumamoto Prefecture. He is said to be the ghost of a human who stole valuable oil, a crime that invited divine punishment. He appears as a squat, compact humanoid figure with a large, potato-shaped head that is often flattened or misshapen, typically half-closed or closed eyes, and a gentle smile. Clad in a traditional straw raincoat, he carries a large walking staff, and some depictions include a topknot. His distinctive head design draws inspiration from the Kane-kubi Bunraku puppet. Abura-Sumashi has a peaceful and gentle nature, coexisting harmoniously with other yōkai and harboring no hostility toward humans. He often assists the Kitarō family as a wise village elder or adviser, and he enjoys playing shogi, regularly inviting others to join him. In the manga, he first appeared among protesters during The Great Yōkai Trial and later resided in GeGeGe Forest, where he aided the Kitarō family by extracting oil from humans or countering spells. He accompanied Kitarō on a journey to Jigoku (Hell), sharing crucial knowledge of that realm. In anime portrayals, he has appeared as a resident of the Yōkai Apartments, the mayor of Yōkai Yokochō, and in an episode titled "The Strange, Forbidden Forest," where he emerged from a tree trunk. Outside the main series, he has appeared in NonNonBa, dancing and singing alongside other yōkai, and in The Great Yōkai War, acting as Nurarihyon’s implied second-in-command. His abilities include remarkable neck rotation, oil manipulation (including body transformation and target intaking), and soul transferring.