Gauche's "Dingo". She is a skillful dog that seems to be very well trained for fighting and tracking situations. She appears to be a skilled hunter as well.

In Tegami Bachi Reverse,
She was a child that was given to Gauche as an assistant from the leader of Reverse. Gauche subconsciously named her after his former Dingo. When Gauche under the name of Noir confronts Lag, Roda in a human female form confronts and distracts Niche.
(Source: Wikipedia)