Kate Periwinkle is a white rabbit character residing in Sweet Berry Valley within the Sylvanian Families universe. Married to Alex Periwinkle, she co-operates the Blackurrant Café, serving tea, coffee, sandwiches, and confectionery supplied by the Chocolate Rabbit family. Kate and Alex have three children: Oliver, who aspires to become a doctor; Rebecca, an aspiring writer who leaves her stories in the café for customers; and Henry, their lively youngest who enjoys interacting with patrons.

Professionally, Kate serves as the nurse for Sylvanian Village. She is admired for her skill in preparing medical equipment and medicine. To ease young patients' anxiety, she stocks the clinic's waiting room with toys and picture books, often playing with babies herself to keep them calm, combining medical expertise with compassionate care.

Personality-wise, Kate favors romantic aesthetics and decorates her spaces abundantly with flowers and pictures. She encourages imaginative thinking in children, frequently sharing fairy tales and stories about princesses and fairies to help them "always keep dreaming," extending her nurturing nature beyond her home. She maintains close family ties, including her sister-in-law, Clarice Buttermilk, a nurse at the Cottage Hospital, and brother-in-law, Victor Buttermilk, a dentist there.

Kate's daily life balances managing the café, her nursing duties, and supporting her children's activities, such as observing Henry greet customers on weekends and noting Rebecca's storytelling contributions.