It looks like the actors behind the voices of Niko and Roman have said that they are not making much off of GTA 4 despite the great work they did. And Michelle… well, having seen the actress who plays Mallorie, why would I still want to date Michelle?

Niko and the actor who portrayed him, Michael Hollick.
From the New York Times article:
…
For Mr. Hollick, Niko has still been the role of a lifetime. A native of the eastern shores of Maryland, Mr. Hollick developed a talent for dialects as a theater student at Carnegie Mellon University in Pittsburgh, he said. In the game Niko is a war-scarred Serbian who has worked as a human trafficker before landing in New York (known in the game as Liberty City). Mr. Hollick’s masterly performance as the voice and body of Niko appears to stem both from Mr. Hollick’s rich conception of the character as well as from a stellar script.
“Developing Niko, the dry sense of humor, as the story begins, he’s this really hard guy with this really difficult background, but what gives it depth is that there is this naïveté as well,†Mr. Hollick said. “He comes to the big city and he’s not on firm ground. He’s not sure where he stands. So there is a lot to work with. And as he becomes more confident, the sense of humor comes out. The screenwriters and directors were really hip to that and really did a great job of making the character three-dimensional.â€
Of course, because this is a video game, in addition to thousands of lines of dialogue, there were the more, shall we say, atmospheric effects.
“So we would have the 50 pages of screaming, 10 pages of being shot, 10 pages of being thrown off a roof, 20 pages of being burnt alive, just screaming,†he said. “The ones being burnt alive were the best. And I’d just be like: ‘Bring me more hot tea and honey and lemon. Earl Grey.’ “







