Mizuki has light pink eyes and hair, slightly curled and worn in a side ponytail tied with a ribbon. Two even strands of hair are let loose, framing their face. They have pale skin and wear pink mascara. Their voice is powerful androgynous. Despite their energetic, carefree, and sometimes childish demeanor, Mizuki is often shown to be the most mature member of their circle, as Ena admits. They often assume the role of mediator in arguments. Their gender is unknown.