Prototype is a blocky robot with a white casing. He is seemingly unfinished, with exposed mechanical elements on their right arm, legs and back of the head. He has blueish-purple eyes with a hot pink highlight. Prototype has four horns: two sets on his head (yellow on the left, red on the right) and two flatter ones (purple on the left, blue on the right) on his lower jaw. Prototype has four-clawlike fingers on each hand, with the "thumb" being red and the rest yellow, blue and purple. The back