Niko Bellic is Eastern European, between 28 and 32 years of age and has come to Liberty City to pursue the "American Dream". Niko was persuaded to move to Liberty City by his cousin Roman, who claimed in multiple e-mails to Niko that he was living a fabulous life, with a mansion, women, hot tubs and sports cars. Roman's claims turn out to be lies to hide his own failures, however, and in reality he only owns a small taxi business, which he wants Niko to work for.
Roman is the only person Niko knows in Liberty City to begin with, and is one of his major connections in the first part of the game. Niko is a tough character, whereas Roman is friendly. Roman is heavily in debt and a lot of people are after him. He desperately needs Niko's support, hence the reason he deceived Niko into travelling to Liberty City. They are constantly bickering. It is later revealed that Niko has also been avoiding other, as yet undisclosed, problems at home.