The appearance of a Protogen's head is more rounded than a Primagen. Beyond having organic ears, other differences from Primagen include that it stands more upright and is more organic. Its torso has some mechanical parts as well as organic fur around it. The legs can be thick or thin. All the body parts except the torso and head have a “plug n' play“ feature where they can replace their tail and arms with many different types of limbs, including aquatic, space, and more to work.