Jax appears to be a periwinkle cartoon rabbit whose design evokes the look of early cartoon characters, also known as "rubber hose" characters He has long periwinkle bunny ears on top of his oval-shaped head, and his overall build is tall and slender. 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 light pink-colored overalls and pale yellow gloves.