Kawauso

Kawauso (lit. River Otter) is a youkai from the anime and manga series of GeGeGe no Kitarou. He first appeared in the Shonen Magazine story Youkai of Obebe Swamp. Because he haunts the Obebe Swamp, he is also known by the name Obebe (オベベ).

(Source: GeGeGe no Kitarou Wiki)