A boss from the Mega Man series whose appearance is that of a large yellow clay monster with a round body, arms and legs, and a single black eye with a red pupil. There are also other variants of this Bio-Devil - the Bio-Devils are single-eyed creatures within the series that are made out of different kinds of things and can come in different colors. The Yellow Devil also has a variant appearing in Rosenkreuzstilette called the Mold Devil.
