Mimii is a rabbit character within the series, her name drawing from "mimi" in reference to ears. She consistently demonstrates a willingness to assist others. Despite her small physical size, Mimii possesses notable proficiency in both dancing and kung-fu.

She engages in various helping activities alongside Kyurun. These range from attempting to make a child fall asleep and chasing away a child's pain, to assisting a child with changing clothes, suddenly working as cafe staff in Sweets Land, helping a child who dislikes carrots, and aiding a tanuki child in selecting a gift for a friend. An April 2024 toy release pairs Mimii and Kyurun, featuring working suspension.