Niko is of Serbian descent, and previously fought in the Yugoslav Wars, however it is unclear for which side.
He is brought to Liberty City by promises of living the American Dream from his cousin Roman Bellic, but when his plans go south, he turns to the seedy underworld of Liberty City to build his way to the top.
In the story you’re given the option to kill him or leave him.
Niko is then faced with a choice: strike a deal with Dimitri, or extract revenge on him.
Niko is a serious, calm, self-reflective character and possesses a deeper intellect and stronger moral guidance than perhaps any other GTA protagonist.
As he fought in the war, he has been trained extensively in weapon use and hand-to-hand fighting skills.
As they slip into debt and are dragged into a criminal underworld by a series of shysters, thieves and sociopaths, they discover that the reality is very different from the dream in a city that worships money and status, and is heaven for those who have them and a living nightmare for those who don’t.
Grand Theft Auto IV takes place in 2008, in a redesigned version of GTA 3’s Liberty City consisting of four districts, based on four of the districts of New York City: Broker (Brooklyn), Dukes (Queens), Bohan (The Bronx), and Algonquin (Manhattan).