"You think because you say nothing... you are strong?"
— Japanese Officer.
The Japanese Officer was a soldier who appeared in Call of Duty: World at War, notably appearing in the mission "Semper Fi". He was presumably the commanding officer stationed on Makin Atoll. He had close-cropped black hair and a mustache.
He played a semi-major role in the mission "Semper Fi", and is the first character seen in the game. Sometime before the start of the game, soldiers under his command captured a group of U.S. Marines, among them Privates C. Miller and K. Pyle. He and a Private 1st Class interrogated Miller and Pyle, while other Japanese troops continuously beat the other Marines. He taunted Pyle, telling him that they are all weak, and questioned if all the Americans were as weak as the two, before the Private spits in his face. He then violently responded by sticking his lit cigarette into Pyle's eye, before ordering the PFC to execute the two Marines and then walking out of the hut. After executing Pyle, the PFC comes for Miller, declaring that he's weak, not noticing Roebuck behind him. He stabs the PFC with his Knife before he can kill Miller. The Japanese officer is strangled to death by Sullivan using his M1897 Trenchgun. His Nambu pistol is given to Miller.
When the officer smokes, it is seen that the smoke is not really inside his mouth, but the cigarette is just near his mouth.
The Japanese soldier that kills Pvt. Pyle is lower in rank than the Japanese officer, as he bows to him as he leaves. His collar insignia indicates that he is a Private 1st Class.
The Japanese officer's line about Miller saying nothing is quite humorous, as the characters in the Call of Duty: World at War campaign do not speak during gameplay.
In the Wii version, the Japanese officer wears an officer's cap.
Takeo Masaki bears a resemblance to the Japanese Officer. In World at War, only his uniform were the same. In Black Ops however, Takeo uses exactly the same model of the Japanese Officer with only a cap added. However in the DLC map Moon, Takeo uses exactly the same model as he doesn't have his officer cap.
If one looks at the Officer when Miller is about to get killed the player can see that Roebuck walks right past the Officer without alerting him.
Many random enemies in other levels, such as "Hard Landing" use the same character model as him.