These are the situations we've seen his character in so far. A close up on the character standing on a balcony, robbing a bank, driving two cars, flying a helicopter, and flying a plane.
I don't know about you, but I think it's pretty obvious he's the main protagonist of the game. There could be more (it doesn't look him riding the bicycle, although that could be a pedestrian), but given the amount of exposure he's had I think he's probably the main character.
Wow great screens. It looks like the ned luke guy, but i am not sure but whatever. It will be great. Since age is a factor to be honest I thought that Niko Bellic is kind of old? right? And Tommy Vercetti wasn't that young either right?