Kouji is a man of questionable morality and knows nothing about duty and manners. Because Akira Nagai knows he wouldn't be able to handle Kouji on his own, he relegates Kouji to the job of standing guard at the entrance, and has assigned Toshiki Kagawa to become Kouji’s mentor. Kouji secretly earns extra money by working as a bodyguard for Jimmy Yan at the Asia Travel Company. During his time off, he enjoys hitting on women. Taking advantage of his good looks, he is a bit of a playboy.
- Kouji's zodiac sign is Sagittarius and he has a O blood type.