|universe=Onegai My Melody
|full name=chuumi rat
|based on=Biker rat
Chuumi is a Sanrio character from the anime series Onegai My Melody, and a member of KUROMI'S5; a group of five bikers with Kuromi as the leader. The other members are Nyanmi, Wanmi and Konmi.
Chuumiis a pale blue rodent wearing sunglasses. Like the other members of KUROMI'S5 she wears a black outfit with a pink skull 'brooch'. Chuumi's birthday is on November 18th. They like the colours black and grey, as well as cheese. Chuumi is able to run away quickly.