Michael De Santa

"Why did I move here? I guess it was the weather. Or the... Ah I don't know, that thing. That magic."

- The protagonist during the teaser tralier

 is the currently unnamed presumed protagonist of Grand Theft Auto V.

Background
"You see it in the movies. I wanted to retire. From what I was doing, you know? From that, that... line of work. Be a good guy for once, a family man. So, I bought a big house. Came here, put my feet up, and thought I be a dad like all the other dads. My kids, would be like the kids on TV. We could play ball and sit in the sun. But well, you know how it is."

- The protagonist during the teaser tralier

Judging by what he says in the trailer he was once a criminal. He left that line of work and moved to Los Santos, presumably he was wealthy as he mentioned buying a big house, to live a normal life with his family. He mentions having children whom he wants to be like the children on TV.

For a currently unknown reason he decided to return to a life of crime, at some point robbing a jewelery store with two unknown accomplices disguised as pest control.