Tapu Koko's inner body is solid black in color with white markings on the chest and face. Yellow rings are present on its shoulders and yellow markings appear on its eyes as well. Its lower body is orange and consists entirely of five feather-like appendages. Tapu Koko's hair, similarly, is orange with a yellow tip in the shape of a mohawk. Its arms are solid with a two fingered hand on each in the shape of a bird's beak, which are connected to Tapu Koko's shell. The shell is a yellow, egg-shaped dome with multiple geometric patterns on the shell. On each side of the shell there are wings.
Although they are known as the guardian, it does not mean that they often help people. They have strong curiosity, and like to decisive victory by fighting with other Pokémon. It is said that Tapu Koko stores its electrical energy by covering itself with its shell.