MIMI is Tak's custom-built model 2 SIR Unit. Her right arm was replaced with a large claw-like arm. MiMi was found by Tak on Planet Dirt during her service as a janitor. She was severely worked on until she was in full working condition. When Tak tried to take over the Earth, MiMi's data card was lost in a skirmish and helped Zim and the others stop her.