Niko was born in Yugoslavia and grew up in modern day Serbia. His father was a bully who Niko never believed in whilst his mother, Milica, was unhappy that her son grew up in such a harsh place. Niko had a brother who was killed, although it is not stated how or when. He had wanted to be an astronaut but in the war-torn Bosnia this was impossible. According to Niko, his mother was one of "life's victims", and he was raised mostly by Roman's mother, who originally wanted him to go to Liberty City with his cousin rather than fighting in the war. It is also revealed by Niko during a conversation with Kate that while Roman was in Liberty City, Niko found Roman's mother raped and murdered. Knowing he would be overwhelmed with devastation, Niko covered up what happened and told Roman that she died in a house fire. Oh and hes a pimp
Niko fought during the Yugoslav Wars as an "angry" teenager, where he witnessed and committed numerous atrocities, leading to his cynical view on life. Niko was almost killed in 1998 when the fifteen man unit he was in were ambushed, with twelve of his friends killed in the attack. Only he, Florian Cravic and Darko Brevic, who had betrayed the unit, survived. He knew that he was not the betrayer, so the only two options were Darko and Florian.
Post War Life
Work was hard to come by following the war, although Niko did not leave, he began working in the criminal underworld for the next ten years. He also continued his search to discover who ambushed his army unit, until his arrest. After being released from prison, he began working for a human trafficking ring under the orders of Rodislav Bulgarin. When a boat sank in the Adriatic during one smuggling run into Italy, Niko managed to swim to safety, although everything else was lost. Rodislav Bulgarin blamed the sinking on Niko, stating he had sunk the ship intentionally to escape with the money. Bulgarin was too powerful to fight back against, and so Niko joined the merchant navy.
Life in Liberty City
Niko spent seven months at sea on the Platypus ship, heading for Liberty City, where his cousin Roman lived. Niko also knew that Florian Cravic had moved to the city. He arrives in Liberty City in 2008 and realizes that Roman's tales of success are lies, as Roman only owns a small flat, a taxi depot and has large gambling debts. Niko ends up working for Roman, protecting his cousin from the loan sharks that keep harassing him. Roman soon loans Niko's services to friends and enemies alike, which angers Niko although he needs the money, and sets in motion the events of the game.
Niko's view of American culture is one of confusion and mild disgust. The rampant materialism annoys him and he has trouble relating to Roman's fascination with the country. Plus, after working for so many criminals, he gains the impression that everyone in Liberty City is a crook.