Noun
A holothurian.
A nudibranch mollusk.
Source: Webster's dictionaryIndeed, the original haiku included the theme "oni" (the "it" in Japanese is a demon, though in some parts a very young child forced to play "it" was called a " sea slug " (namako)). Source: Internet
Patrick Krug, a biologist at California State University, Los Angeles named a sea slug with traits of sexual flexibility Alderia willowi partly for his grandmother and partly after Willow's character. Source: Internet