The Niko That Almost Wasn't
Niko's look was partly based on actor Vladimir Mashkov, who's known for playing Sasha in Behind Enemy Lines, and Rockstar actually approached him to voice the character. He turned it down - reportedly he wasn't that interested in video games, Rockstar were being extremely tight-lipped about the whole project, and the recording setup would've meant constant flights between Moscow and New York. Word is he ended up regretting the decision once the game blew up.
