Niko Bellic is the protagonist of Grand Theft Auto IV.

The statement is true as Niko Bellic is indeed the protagonist of Grand Theft Auto IV. In the game, players control and navigate the story through the perspective of Niko, a war veteran from Eastern Europe who immigrates to Liberty City in search of a better life. As players progress through the game, they uncover Niko's past and get involved in various criminal activities, ultimately leading to their own moral choices and outcomes. Throughout the game, Niko's perspective and actions shape the narrative, making him the central character and protagonist of the game.