Sano is a naga with heterochromia. He has one gray eye and a blue eye under the bangs. He has black hair and a scar on his nose. Since Sano is a black mamba, he has a black tongue and deadly venom in his fangs. Sano has a younger twin brother, Akira. Since childhood, Sano and Akira have not received attention and care. Although Sano is cold-blooded, he really likes when people are interested in him. Also, most importantly, Sano has a doctor's degree. In naga form, Sano has a white tail.