Toshio Kotegawa

As the easygoing proprietor of the Grand Blue diving shop, this laid-back individual serves as Iori’s uncle. He possesses a remarkably jovial temperament, maintaining a calm and tolerant attitude even when the club members descend into chaotic drinking sessions and wild parties. Rather than reprimanding the group for their frequent antics, he remains unfazed by the continuous mayhem, embracing the boisterous lifestyle that defines the shop's lively atmosphere.