Rokuzō was a boy in his early teens. He had shortly cropped, brown hair and brownish-gold eyes. He wore a light blue button up under a thick, white knitted sweater with the sleeves pushed up. He donned a brown bracelet on his left wrist.
His attire consisted of tightly fitting, dark green pants with the right pant leg partially rolled up. He had white high top sneakers.
An impatient and intelligent young boy, Rokuzō held disdain towards anyone who wasted his time, especially when it came to work. He strongly resented Doppo Kunikida's involvement in his life, associating him and the Azure King with his father's death. However, he was not uncooperative towards him, going as far as to agree to dig information about the Azure Messenger and serial kidnappings in Yokohama.
When he learned the culprit of the kidnappings was his father's killer’s lover, he didn't hesitate to shoot and kill her.
Rokuzō had no supernatural ability, but was highly proficient with hacking into computers and gathering information.
Rokuzō's father was murdered by the Azure King. Feeling heavy responsibility for the boy's well-being, Kunikida took to providing him with appropriate living accomodations and resources. Living alone, Rokuzō developed proficient hacking and informational skills.
- Rokuzō owned tropical fish that he kept in a tank.
- Rokuzō is named after the important character in Doppo Kunikida's romantic work "Spring Birds".