Suenaga Mimi is the daughter of Misuzu Suenaga, born from her affair with the late politician Seishirō Kuroda. She enters Kintaro Yajima's household when Misuzu marries him, becoming stepsister to Kintaro's son, Ryuta.

Mimi features as a supporting character across adaptations. In the 1999 live-action film, she appears amidst Kintaro's confrontations with influential figures such as Mr. Tanioka and the Tempoh Gang. The 2001 anime television series includes her within its recurring cast, with her presence spanning all 20 episodes.