Risa

Risa is a minor character in the series that appears in the Spirit Bear Arc.

Appearance
Risa is bald save for a single strand of light hair. She has short, round-ish dark eyebrows and two dark circles painted on her cheeks.

Personality
Risa is only shown as a baby and thus, we cannot make any assumptions about her personality.

Background
Risa is March's younger sister. She can't walk or talk yet.

Plot
Risa is one of the girls deemed fit to be sacrificed to the Great Oniguma. Hayase threatens March that, should she try to run away from them, her sister would become the sacrifice instead. (or as she phrased it "We will choose the other girl, who cannot run.")