Jax has a rabbit-like appearance, which is reminiscent of early cartoon characters. His skin is lavender in color, he has long rabbit ears atop his oval head, and his overall figure is tall and slender with a long neck. Jax's eyes have yellow sclera and square black pupils. Jax's yellow teeth are usually flat in shape, but when his mouth is open, his teeth appear sharp.

Jax is the youngest of all the humans trapped in the circus world, at 22 years old.

Jax is a mischievous, laid-back, sassy, ​​egotistical, and brazenly patronizing individual, and rarely shows any empathy or remorse towards those around him. He is indifferent to his imprisonment in the Digital Circus, an attitude that extends to his interactions with others.