As a robot, K1-B0 is considered sexless and lacks the means to engage in reproductive functions, but still appears masculine physically and has the voice of a teenaged boy. His face is very pale, and he doesn't appear to possess anything resembling skin anywhere else. His eyebrows press closely to his round, mechanical blue eyes, making it appear that his brows are a part of his eyes. Thick black lines run from around his eyes and down his cheeks to reach his chin.