Susuwatari

Susuwatari (Japanese ススワタリ; "wandering soot"), also called Makkuro kurosuke (真っ黒黒助; "pitch-black assistant"), is the name of a fictitious yōkai which was devised by Hayao Miyazaki, drawn by Ghibli studios and known from the famous anime-productions My Neighbor Totoro and Spirited Away where, in the former, they are identified as "black soots" in early subtitles and "soot sprites" or gremlins in the later English dubbed version.