Mimi is an anthropomorphic character with blonde hair who serves as a friend to the protagonist in the animated series. She appears alongside other core characters across both seasons, participating in various adventures within the prefecture and contributing to group activities exploring their setting. Her involvement extends into franchise promotional activities, including live events and concerts organized under the Gunma-chan brand, such as Gunma-chan Theatre Company performances. At these events aimed at children, featuring music and interactive segments, Mimi performs alongside fellow characters like Gunma-chan and Aoma. She engages in song and dance routines during these concerts, including original tracks like "SWITCH!" and "Guu! Guu! Gunma-chan". Her design aligns with the franchise's consistent anthropomorphic theme.