Wooper is a mostly blue amphibious Pokémon that bears a resemblance to a real-life salamander known as an axolotl. Wooper stands upright on its small, round feet, and has a large, thick tail. Wooper also has purple-colored, branching gills coming out of the sides of its head, and what look like dark-blue, curved gill-like markings on its torso. Wooper's head is large compared to its body, its mouth is wide and its eyes are small, round, and black in coloration.