Olga Gurlukovich is the daughter of Sergei Gurlukovich, and a member of his private army, the Gurlukovich Mercenaries. She took command of her father's unit after his death. She was then forced into joining the Patriots, after they stole her daughter Sunny Gurlukovich. She worked as their agent, playing an important role in the Big Shell incident of 2009.
Olga led her father's mercenaries when they captured the transport ship Discovery in his attempt to seize Metal Gear RAY in 2007. Sergei's intention at the time was to use RAY as a super weapon with which to re-establish Russia as a major world Power (international). He boarded the ship with the help of Revolver Ocelot.
After the ship was secured, Sergei ordered Olga off the ship (out of concern for her unborn child), but she refused, and was subsequently confronted by Solid Snake. He shot her with a tranquilizer, and continued on his mission of surveying the Discovery, but later rescued her after Revolver Ocelot had killed Sergei and critically damaged the ship (however, Olga believed Snake had murdered her father.)
After Raiden was held aboard Arsenal Gear, Olga revealed herself to him, setting him free, and telling him of the S3 plan. Raiden, with the help of Solid Snake, escaped and was confronted by Solidus Snake. At this point, Olga revealed her true identity to all, including Solidus, determined to help Raiden, since his death would mean the murder of her child by the Patriots. Angered by Olga's double-cross, Solidus easily overpowers Olga and executes her with his FN P90, pleading to Raiden before the fatal gunshot that he must live for her daughter's sake.
It should be noted that it was Olga who had given Raiden (via Solid Snake) his trademark H.F. Blade (which is frequently shown in official artwork of him) near the closing of MGS2.
