Cold and extremely secretive, Nicholai is the sergeant in Mikhail's U.B.C.S. platoon and also comes from Russia. While he seems to another one of the team, his attitude and ability to pop-up worse than Carlos gives you the feeling that something else is going on, above the level at which the U.B.C.S. is acting at.
While at first he seems to not want to work with Jill, telling Carlos that he shouldn't waste his time, the lack of him being around means that in the end it doesn't really matter... sure by now you probably know that he's the main human bad guy in the game.
As with the other surviving members of the Umbrella Biohazard Countermeasure Force, Nicholai is a playable character in the "Mercenaries: Operation Mad Jackal". The toughest character to play as, his game leaves you with a handgun, knife and a few herbs to play with, requiring you to have a lot of skill and luck to finish fully.