Mimi Marquez, a character in Rent, a musical based on La boheme
Mimi Lockhart, a character from NBC soap opera 'Days of Our Lives'
Mimi Bobeck, a character from The DrewCarey Show
Mimi Morton, character from What About Mimi?
Mimi, character in Digimon
Mimi Slocumb, character on Igby Goes Down
Mimi Miney, character in the Ace Attorney series
Mimi, the nickname of MariahCarey, originally between her family and close friends; her 2005 comeback album The Emancipation of Mimi was named after this nickname
"Screaming meemies" is WWI army slang, originally a soldiers' name for a type of German artillery shell that made a loud noise in flight (from French women's name Mimi), extended to the battle fatigue caused by long exposure to enemy fire.