Wikipedia
Susuwatari
Susuwatari (, ; "wandering soot"), also called Makkuro kurosuke (; "makkuro" meaning "pitch black", and "-suke" being a common ending for boys names), is the name of a fictitious yōkai which was devised by Hayao Miyazaki, drawn by Studio Ghibli, 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, as "soot sprites" or "dust bunnies" in the Streamline Pictures English dub, and as " soot gremlins" in the Walt Disney Studios English dubbed version.