The U-3 displays the biological features of each of its genetic-benefactors, though imperfections in the technology that created it led it to appear asymmetrical in shape. The upper part of the body is that of a human torso, displaying a monstrously-warped face and marked by strange scars upon its nape and crown. Its spinal column is also human in origin. The creature's right arm was clawed, while its left was a long tentacle which it used as a whip against enemies. Its four front and hind legs appeared bonded by a centipede-like fleshy piece of muscle.