Mimi is a supporting character in the anime With You and the Rain. She is a close friend of Fuji and Ren, having been a classmate of Fuji since high school. On the surface, Mimi projects a cool and elegant demeanor, but beneath this composed exterior she is warm-hearted, dependable, and deeply considerate of those around her. She naturally tunes into the needs of others without being overbearing, and she often looks after her friends like a protective older sister.

Mimi has harbored a fondness for animals since she was young, which makes her especially curious about You, the unusual creature Fuji took in. However, during their first encounter, she made a careless remark about You, and as a result, You has kept a certain distance from her ever since. This early misstep creates a minor but persistent rift between Mimi and You, and she quietly hopes to bridge that gap.

In the story, Mimi serves as a stabilizing presence in Fuji's life. While Fuji is reserved and introspective, Mimi offers grounded support and gentle encouragement without prying. Her role is that of a trusted confidante who respects Fuji's space while remaining reliably available. Through her interactions with Fuji and Ren, and her ongoing attempts to connect with You, Mimi demonstrates growth in her ability to express care more directly. She does not possess any extraordinary or supernatural abilities; her notable strengths are her emotional intelligence, her perceptiveness, and her quiet reliability.