|Date of Birth:||21 years before E-Day age 37 in gears 3|
|Voice Actor:||John DiMaggio|
Marcus is Gears of War's main character. He is voiced by John DiMaggio.
Marcus is an elite veteran soldier and the leader of Delta Squad. He has been fighting against the Locust Horde for 15 years. Marcus was sent to prison for quitting his military obligatory in order to try to save his father's life. He was a former COG (Coalition of Ordered Governments) and was going up his way to higher prestiges. During the Locust war, Dominic Santiago rescued his best friend, Marcus, from the penitentiary prison and Marcus was soon back into the Military to help fight the Locust. He's was 35 years old in Gears of War, with the height of 6.1 ft, blue eyes, and black hair. Marcus is also known as a legend, during the Pendulum Wars and as recently, the locust war. What was known as a victory to the human race; Marcus lead Delta Squad to a victory by detonating the Lightmass Bomb which handed a vital blow to the Locust Horde in Gears of War, hoping it would destroy the Locust tunnels, and ending Gears of War 1.
Six months after (Gears of War 2), Marcus had numerous of other duties, but his greatest objective was to destroy the Locust stronghold; the Hollow. In his search, he discovers how the Locust sink cities with the Riftworm and killed it from the inside. He then received news from Commander Hoffman to find information base on the Locust Queen. Marcus soon found the Hollow and and the Locust Queen, Myrrah, with Skorge. Skorge engages battle with Marcus and dom, and retreats after. Marcus and the crew rush towards two reavers and shut out the idea of capturing the queen. Instead, Marcus gets a hold of a brumak in hopes to make enough room for another another lightmass bomb. During this time, the Brumak is exposed by the immulsion and starts to mutate. Fenix came up with the bright idea of destroying the Lambent Brumak with the Hammer of Dawn in replace of the lightmass bomb.
Marcus has a humorous sarcasm, but can take things into serious note. One of his sarcastic jokes was when he just informed how to defeat a Berserker ("It's just the wind"). Marcus's voice is done by John DiMaggio, who also does the voice of Bender from Futurama. Marcus's dad is a military scientist called Adam.
Marcus' best friend was Carlos Santiago, which was killed in the Battle of Aspho Fields. Later, Dominic and Marcus had started a companionship. The two have a deep friendship though it is not often shown in the game. In one particular decision in GOW2, Marcus deviates from the mission's most direct objective to help Dom determine the fate of his beloved wife, even though it goes against his soldier's training and instincts.
Marcus also appears to have a love interest with Anya. Again, this is not something obvious in-game due to Marcus' gruff demeanor. Towards the end of GOW2 there is a moment where Delta squad believe Anya to have perished in the sinking of Jacinto, and Marcus shows a rare moment of vulnerability when Dom tells him he's sorry. This story arc is also hinted at in the Gears comics, and fans speculate Gears of War 3 will build upon the love interest.