Jax appears to be an anthropomorphic 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 has thin eyebrows that appear.