Juki's mask is modelled from the head of the Jukimara Andean Bear.

Juki was caught working in a cocaine factory and sent to prison without a trial. He is the prison’s cleaner and knows all its secrets, he’s walks through the prison at dawn, sweeping while everyone is asleep. Juki’s limbs are not those of a human, they're of a bear (The Jukimara, the Andean bear). His legs are the legs of a bear with paws at the bottom. Because of these physical characteristics, Juki has limited abilities to do his job delicately. He is careful but unable to control his animal limbs, which are rather incompatible with his work.