Snivy is a reptilian Grass-type Pokémon. Most of its body is green in coloration, while it has a cream-colored underside. A yellow stripe runs down the length of its back and tail, and it also has yellow markings around its large eyes, extending from its eyelids. Yellow, curved structures protrude from its shoulders and bend backwards. These structures resemble leaves or small wings, as well as a fleur-de-lis when viewed from the back, and give Snivy the appearance of wearing a collar. In spite of being snake-like in appearance, it has fully-developed limbs. Its slender arms are the same green color as the rest of its body and have three fingers, while its tiny feet match its underside in coloration and have no digits whatsoever. It has a large, palmate leaf with three prongs on the end of its tail.
Similar to its pre-evolution, Snivy, Servine is primarily green with a cream-colored underside. It has a yellow collar-like structure that starts at the chest and proceeds behind the shoulders. Three palmate leaves grow along its back and tail. Servine has four short limbs and a small crest protruding from the back of its head. It has narrow red eyes and a sneering face.
Serperior is a primarily pale-green, snake-like Pokémon. Serperior has curled pale-green patterns on the sides of its face and snout, and small, pointed yellow extensions 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, resembling a fancy collar. It has narrow red eyes, and small, pointed teeth on its lower jaw. 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. It has lost its legs completely, and now only has small, stubby hands.