Mimi Tanaka is Kiki's sister and also her bridesmaid. She appears only in the episode "A Shot in the Dark" of Season 6. Portrayed by Zoe Chao. She wants Kiki to wear a veil at her wedding, and later is behind the Dirty Robber's bar making margaritas for the wedding guests.
After the wedding, Vince Korsak asked Kiki about Mimi, and Kiki says she was inside the bar and drunk enough that she avoided most of the chaos.