Serperior is a primarily pale-green, snake-like Pokémon. Serperior sport curled pale-green patterns on the sides of their face and snout, and small, pointed yellow horns on the back of their heads. Its face and upper neck are white-colored, and curled, tendril-like darker green extensions spread out from the sides of its lower neck, forming a curling pattern lower down the body. The upper section of its body is dark green, and the lower pale green. Curled yellow patterns adorn its body, and a sprig-like feature of several leaves tip its tail.