Tearai-Oni (手洗い鬼, Hand washing demon) is a yōkai.
His appearance in the manga is drastically different from his illustraion and the design used in the fifth anime.
Kitarō Kunitori Monogatari
Although he was summoned from Shikoku to aid Kitarō and others to capture an egg-shaped UFO which was an order of the deputy prime minister of Japan, he was a rough individual. Being irritated with the quick-moving UFO, he ignored the priority and crushed the UFO with his foot, killing the alien inside, but he was happy with the outcome. Humans accused his actions and told Kitarō and others to take him home.
Due to the fifth anime adaption's sudden cancellation at 100 episodes, he is among the 23 Yokai Warriors that were not revealed aside from the movie.
He briefly appears in episode #48 The Void of Despair and Darkness along with many other yōkai.