Mii-chan (ミイちゃん Miichan), called Mimi in American English dub, is a female cat living near Nobis' Residence. Doraemon often goes on dates with Mii-chan.
In the 1973 anime, Mii Chan has a wider face, in the 1979 anime, Mii Chan is a grey cat with a white circled face and ears, and in 2005 anime, Mii Chan redesigned.
Doraemon is her love interest. When Mii-chan is on trouble, Doraemon will always help and rescue her.
Mii-chan get along pretty well with her "mother-in-law", much to Doraemon's dismay.