Koutarou Sakazaki

Оригінальне ім’я: 坂崎孝太郎

A middle aged man, security guard whose daughter and wife left him because of his economical problems. He's been looking for a young gambler to help him since then to beat the Bog and win enough money to buy a house so his wife and daughter will return to him. At first he wants Kaiji to help him beat the Bog but later helps Kaiji defeat the Bog.