Chief superintendent of the criminal investigation division.
He asks Date to investigate the money-laundering during the missing 10 billion yen case.
Yakuza 2 Edit
During the second game, Sudo helps with the investigation of the Jingweon mafia. He pilots a helicopter to evacuate Kiryu and Sayama from the bomb at the end of the game, but due to the lack of time he is forced to retreat from the area.
Yakuza 3 Edit
Sudo only appears at the start of the third game, where he reveals to Date that the people involved in the Jingweon incident were promoted to keep their mouths shut about Kurahashi infiltrating the police force.
Yakuza 4 Edit
He reappears twice in the fourth installment. He aids in the cornering of Sugiuchi at the docks but is hesitant to use force to stop him knowing the kind of immunity Sugiuchi possessed. He again flies a helicopter above the Millennium tower after the final battle with Seishiro Munakata, while Date distributes copies of newspapers all over town telling the truth about Munakata.