Nezu is a stout creature who appears to be a possible combination of several different animals, including a dog, a mouse, and a bear, which would make him a chimera. He has the head of a mouse with circular black eyes, a large scar over the right one, relatively rectangular-shaped ears with pale pink insides slanting outwards from the top of his head, and an elongated muzzle with a small round nose. His fur is white and has large, dog-like paws with pink pads and a thin tail like that of a cat.