Mimi is a young rabbit character central to the series, established as the younger sister of recurring character Floppy Rabbit. Her design features white fur, three thin black whiskers per cheek, a dark brown nose, and white or light blue eyes. Light pink inner ears, a fluffy white tail, and a distinctive patch of brown curly hair atop her head complete her appearance. Her standard outfit includes a pink dress with a blue rounded collar and red button, light yellow stockings or socks, and sand green shoes. Alternate attire consists of a pink one-piece swimsuit for aquatic scenarios and light yellow or light purple undergarments worn under her dress.

Her familial bonds center on her immediate rabbit family: older brother Floppy and her parents, whose specific roles and names remain undefined. She maintains strong friendships with young animal villagers Laura Koala (Roobear’s younger sister), Betty Koala, and Pamie Penguin, identified as her closest companions. Her broader social circle includes Roobear Koala, Nick Penguin, Mingle the sugar glider, Kiwi the kiwi bird, and occasional adult figures Miss Lewis and Weather, characterized by friendly or mentor-like interactions. Relationships with Walter, Horsey, and Colt Kangaroo fluctuate between friendly and antagonistic, forming a frenemy dynamic.

Episodic narratives feature her in group activities and events. She collaborates with Roobear, Floppy, and others on projects like creating a large-scale painting of a significant tree, though wind disrupts their efforts. She participates in village social events, such as the "Who Will Be the Flower Queen?" contest, highlighting her friendships with Laura and Betty while creating a dilemma for Roobear. She interacts with Diana, a visiting rabbit girl portrayed as a potential "Moon Goddess" in one episode. While present across numerous adventures with the main ensemble, the sourced material lacks documentation of detailed narrative arcs focusing solely on her personal growth or background development across the series, potential movies, OVAs, or spin-offs. Information regarding a defined character arc or significant evolution throughout the series’ run is unavailable.