Kotobuki is an imposing man, being significantly taller and more muscular than Iori and Kouhei. He has spiky blond hair which he slicks back when working as a bartender. His wardrobe usually consists of hoodies, t-shirts, shorts, and pants, though he prefers to wear only boxers or be naked when possible.
Kotobuki is described as troublesome by Iori, as he and Tokita are usually the ones who initiate the partying and drinking. He is very boisterous and rowdy, though he does take diving seriously. As a bartender, he is very popular, as he does his jobs well and is a good listener when it comes to the troubles of his customers.
- Shinji Tokita:Not much was known about their past but it seem like they get along very well and are good friends.