Barrett is a blue donkey with long blue hair and nose. He has a goatee (or possibly a neck-beard or a patch of chest hair, as it does not move when he speaks). He wears a blue button-down shirt with a tie and pants. He has dark blue hooves and black eyes.
Barrett seems to be the leader of the group, and is of a serious disposition. He is always urging the band to leave off their hi-jinks and to start practicing.