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 six horns: two sets on his head (yellow on the left, pink 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 pink and the rest yellow, blue and purple. He/they