Mimi was one of the classmates of Ganta that was killed during the attack on his class from the Red Man.
The character of Mimi is a minor character of the manga/anime series Deadman Wonderland that was written by Jinsei Kataoka and illustrated by Kazuma Kondou. The series first began serialization in Kadokawa Shoten Shōnen Ace magazine in July 2007.
Her first appearance was in Deadman Wonderland Volume 1 CH. 1 "Who Killed Cock Robin", and her first anime appearance was in Deadman Wonderland - Episode 1 "Death Row". Her character in the Japanese series is voiced by Megumi Takamoto. Her Funimation dub actress is Lindsay Seidel.