Jax appears to be a lilac cartoon rabbit whose design evokes the look of early cartoon characters, also known as "rubber hose" characters. He has long bunny ears on the top of his oval-shaped head, and his overall build is tall and slender, with a rather long neck. Jax's eyes have yellow sclera, with square black pupils. Jax's yellow teeth usually have a flat shape to them, but when his mouth is opened, his teeth appear sharp and jagged. Jax wears pink overalls.