Gradient Joe is a Caucasian male with a black-to-white radial gradient for a head (though this color can change based on his emotion, particularly red when angered, as seen in "Under the Oak") . He wears business casual attire, with a light blue collared shirt & dress slacks, as well as a striped blue tie and dark brown shoes. In the episode “Under The Oak” when Joe is trying to win the mayor election he is wearing a black long-sleeved business suit with his striped blue tie.