
Quick answer — Masato Hagiwara voices Kaiji Itou in Kaiji - Ultimate Survivor, Toua Tokuchi in One Outs, Shigeru Akagi in Akagi and 1 more characters.
Masato Hagiwara voices Kaiji Itou (Kaiji - Ultimate Survivor), Toua Tokuchi (One Outs), Shigeru Akagi (Akagi), Takuya Shirakawa (The Place Promised in Our Early Days).
Kaiji Itou is voiced in Japanese by Masato Hagiwara.