Homunculus (ホムンクルス, Homunkurusu) is a demon in the series.
History
Homunculus (Latin for "little human", from the diminutive of homo; plural: "homunculi") is a term used, generally, in various fields of study to refer to any representation of a human being. Historically it referred specifically to the concept of a miniature though fully-formed human body, for example, in the studies of alchemy and preformationism. Currently, in scientific fields, a homunculus may refer to any scale model of the human body that, in some way, illustrates physiological, psychological, or other abstract human characteristics or functions.