Jean's character design seems to be modeled after his initial manga appearance, although depicting him somewhat older. He seems to be in his mid-to-late twenties and has blonde hair, with fringe covering one of his eyes.
Francoise first refers to Jean as having been very protective of her when they were children, with him fighting off bullies that had been harassing her.
- Jean's appearance is strongly reminiscent of Osamu Tezuka character Dr. Black Jack, only with blonde hair instead of black. This design is also shared with fellow Ishinomori character Ichiro, better known as Kikaider 01.