Dom during Operation: Hollow Storm.
Dominic "Dom" Santiago is the deuteragonist of the Gears of War franchise and was a Gear soldier in the Coalition of Ordered Governments army.
History
Dom was the younger brother of Carlos Santiago and son of Eduardo Santiago and Eva Santiago. Born in a Pre E-Day Sera, he grew up listening to his father's war stories and going to school with Carlos and best friend Marcus Fenix. Dom later joined the army as a commando and took part in Operation Leveler. On Emergence Day, Dom lost both his children, and his wife Maria went into a deep depression and she later disappeared. Years later Dom freed his friend Marcus from Jacinto Maximum Security Prison and recruited him into Delta Squad.
His battlefield intensity is rivaled only by his loyalty to Marcus. Dom's friendly and outgoing nature lets him form relationships with factions throughout Sera, including the Stranded. He's always quick with a joke, but Dom's amiability masks an inner conflict that makes the war against the Locust far more personal. After being forced to euthanize his wife during Operation: Hollow Storm, Dom became more withdrawn from his squadmates, but continued to fight hard alongside them during the Stranded Insurgency and Lambent Pandemic.
Dom, now bearded, as he appears in Gears of War 3.
When the COG collapsed, Dom joined the rest of Delta aboard the CNV Sovereign, serving as a member of a rapid response force that defended former COG communities. Dom was killed during the Mission to Mercy, sacrificing his life to destroy a fuel tank that wiped out a large Locust and Lambent force that had trapped Delta-One.