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. He wears business casual attire, with a light blue collared shirt & dress slacks, as well as a striped blue tie and dark brown shoes. Not much is known about his personality, as he does not speak, but Bugbo has stated that Gradient Joe is very clever. Instead of talking, he communicates through gestures or by writing on paper.