Grand Blue Wiki

Ryūjirō Kotobuki (寿(ことぶき) 竜次郎(りゅうじろう) Kotobuki Ryūjirō? ) is a supporting character of the manga series Grand Blue. He is a third year Mechanical Engineering student at Izu University.



Kotobuki is an imposing man, being significantly taller and more muscular than Iori Kitahara and Kouhei Imamura. He has spiky blond hair that he slicks back when working as a bartender.

His wardrobe usually consists of hoodies, t-shirts, shorts and pants, although he prefers to wear only boxers or be naked when possible.


Kotobuki is described as troublesome by Iori Kitahara as he and Shinji Tokita are usually the ones who initiate the partying and drinking. He is very boisterous and rowdy, although 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.


Peek-a-Boo members:[]

  • Shinji Tokita: Not much was known about their past, but it seem like they are good friends who get along very well.

Grand Blue employees:[]


  • The name Ryuujirou means "dragon" (竜) (ryuu), "next" (次) (ji) and "son" (郎) (rou).
  • Ryuujirou's surname Kotobuki means "longevity, congratulations, one's natural life" (寿).


  • Kotobuki works as a professional bartender part-time.
  • Kotobuki is just like Shinji Tokita both in appearance and in personality when they are partying, but Kotobuki can be surprisingly charismatic.