Context: The protagonist of Metal Gear Solid 2 is a young rookie agent named Raiden. He is supported by his commanding officer, the Colonel, and Rosemary, his girlfriend. Allies formed on the mission include Lt. Junior Grade Iroquois Pliskin, a Navy SEAL of mysterious background who provides his knowledge of the facility and later revealed as the claimed terrorist Solid Snake; Peter Stillman, a NYPD bomb-disposal expert; Otacon, a computer security specialist; and a cyborg ninja imitating Gray Fox's persona, first calling itself Deepthroat, then changing its name to Mr. X.

Question: who do you play as in metal gear solid 2?
Steam of consciousness below:
To answer the question, consider the following: The protagonist of Metal Gear Solid 2 is a young rookie agent named Raiden.
So, the answer is a young rookie agent named Raiden.