Kai is described as having the beauty of a woman. He has a slender build, shoulder-length black hair parted down the middle and dark eyes. Kai often has a blank, inexpressive face.  He wears a red-orange apron given to him by the Chidouin family over a long-sleeved black changshan. Kai's usually seen holding various kitchen utensils behind his back, specifically a ladle, spatula, and frying pan.

Kai has a seemingly aloof and absentminded nature. He's often quiet, even during intense discussions and accusations. Because of his quiet nature, he isn't considered to be much of a person of interest to the group. Though like the others, he makes it apparent that he wishes to try his best to contribute to their advancement, even if his withdrawn demeanor and weird aura put Sara off. 

While working for the Chidouin family, he developed a soft and caring side for them, particularly for Sara, and decided to go against his group. He attempted to stop the Death Game from starting up, or at least protect Sara, but ended up failing.