Kurumi Risu is the mother of the Kurumi Risu family, a squirrel character who consistently fulfills that maternal role. She is part of a family unit that includes her son, Kurumi Risu-kun, also called Ralph Walnut, and her partner, Kurumi Risu Otosan, also known as Cedric Walnut.

Her role remains unchanged across various installments of the "Sylvanian Families: Mini Story" franchise, specifically in the seasons "Mini Story Clover," "Mini Story Ivy," and "Mini Story Peony." She often appears with other characters named Miranda, Ralph, and Sky.

In the English adaptation of the franchise, this character is represented by the toy line figure Yardley Walnut. She also appears in "Sylvanian Families: The Movie."