Jax is a tall, anthropomorphic periwinkle cartoon rabbit whose design elements evoke the look of rubberhose characters, despite having actual joints. 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 that contract when angered and heavily dilate when at a loss for words. His eyes change into animated scribbles when he is stressed or anxious. Jax's yellow teeth usually have a flat shape to them, but when his mouth is opened, his teeth appear sharp and jagged. Almost every time he is talking, his teeth stay closed while only his lips move. Jax has thin black eyebrows that appear in the majority of scenes. In "They All Get Guns" and onwards, Jax has a small spherical tail which he didn't have before the episode, being mentioned briefly during Untitled when Jax is talking to Pomni while during the "Stargazing" segment. Jax wears light pink overalls and pale yellow gloves. His overalls feature yellow buttons, a single lighter pink pocket on the front, and lighter pink roll-up cuffs at the hem. He is usually barefoot