Coo is the pet peacock of Meister Kirisaki. It normally hides behind his mask.
When it comes out, it has the power to lift him in the air and fly around.
It also does covert surveillance, and is able to dial a telephone and speak to him over the telephone, telling him what was observed.
It later takes a plane to Paris with the main characters as they train for the upcoming Cup.
Coo seems to hate afros, or possibly just Kyousuke.
Sophie also knows Coo and recognizes the group when the bird follows them to Paris.