Tai Kaliso - A boulder of a man, Tai Kaliso's hailing from Irohma island muscular appearance stands in contrast to his quiet, meditative personality. Tai descends from a long line of men who viewed themselves not just as fighters but as warriors. This lineage molded Tai into a warrior-philosopher with a spiritual view of war that often causes odd glances from his squadmates. However, they like and respect him, even if they don't always understand him. Tai and Marcus have a long history of saving each other's lives during the pendulum wars.

Colonel Victor Hoffman - is the current chief of Defense Staff of coalition of ordered governments and former director of special forces, answering only to chairman Richard prescott. He is a battlefield commander, and had fought alongside his fellow gears in both the pendulum wars and the locust-human war. A military man to the core, Hoffman demands discipline and sacrifice from those under his command. Hoffman's strict adherence to these ideals has caused him to cross swords with Marcus Fenix. Hoffman's testimony helped convict Marcus of dereliction of duty, although Hoffman later promoted him to sergeant out of necessity. As the war with the locust escalates, Hoffman must put aside his doubts and rely again on Marcus and delta squad.

Minh Young Kim - was a COG soldier who was killed in combat by General RAAM. He was a proud field lieutenant and was promoted to such a rank for his behavior on the battlefield. His style was always to fight honorably, and believed that the gears along with the coalition of ordered government are the last defense against the locust horde for all of humanity's sake.

Anthony Carmine - As the former youngest member of delta squad, Private Anthony Carmine makes up for his inexperience with unbridled enthusiasm and genuine respect for veterans like Dom and Marcus. In fact, he's so enthusiastic that he runs out into the open in combat, completely disobeying the golden rule of the gears. Unlike senior Delta Squad members, Carmine prefers to wear the standard COG-issued helmet to protect his head. Probably not his best choice, since it obscures his vision slightly from far enemies, but protects his head better than other characters and he was voted "most likely to get shot" at the military academy.

Queen Myrrah - At various times throughout gears of war, narration is provided by a female character - the Locust Queen; her voice is heard during the opening cinematic, the death of lieutenant Minh Young Kim, and the end-game sequence, as well as during split-screen and online multi-player (if playing on the locust side). Her voice is heard throughout the campaign and several locust characters mention her. For example, when General RAAM emerges onto the platform on the train, he says "Serve the Queen!" In addition, when Marcus is faced with boomers, they can be heard gargling "For the Queen!"

Throughout the game, Locusts treat the Queen with the utmost respect, dying for her as necessary. The Chain of Command in the Locust Horde is that of a hierarchy, whereby Queen Myrrah is the central leader. She is the only Locust that looks remotely human.

Also, for reasons unknown at the moment, she happens to know Adam Fenix.

RAAM - is the main antagonist for the first Gears of War and is a mostly silent and savage, yet unrivaled, locust general with a dark presence that will make even the bravest gears feel an overwhelming sense of dread, fear, and hopelessness. The blood of billions (soldiers and innocents) are on his hands, both directly and indirectly. Once a theron guard, the cunning and ambitious RAAM usurped the military leadership of the Locust Horde through skill and intellect. RAAM was, quite possibly, half the reason the Locust were winning the war. He is the only known being able control the kryll. In battle he could shroud himself in kryll, which acted as a shield. He could also command them to attack his enemies.He possessed great strength (possibly even greater than that of boomers), able to wield a troika machine gun by hand with ease. RAAM also wielded a serrated blade at times, which he used to impale Lieutenant Kim. He was also seen killing a gear with a boltok pistol after listening in on delta squad's plan to launch the lightmass bomb into the hollow, by using data contained in Adam Fenix's estate (therefore, he was able to send his troops there before delta squad arrived).He was encountered yet again on the Tyro Pillar, a cargo train, heading into Timgad, and a huge pit of Imulsion. It was here that the notorious Locust general eventually met his demise at the hands of Marcus Fenix and Dominic Santiago, with the help of a King Raven helicopter, commanded by Colonel Victor Hoffman, and with turrets controlled by Damon Baird and Augustus Cole, while he was attempting to prevent the detonation of the Lightmass Bomb, and the destruction of his kind.

Skorge - is one of the new boss characters in gears of war 2. He is the new main antagonist, much like RAAM from the original Gears of War. He wields either a Gorgon Burst Pistol, or the Dual Chainsaw Staff. Skorge is also an unlockable character that can be used in multiplayer. Marcus engages in a battle with Skorge in the queen's throne room and aboard a Hydra. Dizzy and Tai also engage Skorge, however, Tai was captured, and Dizzy is Missing In Action.