Dean Winchester is the oldest of 2, technically 3 boys. His youngest brother took his place as the human vessel for the Archangel Michael, who's destiny is to destroy Lucifer, whose human vessel is Dean's middle brother Sam. Sam and Dean are in the family business of saving people (see: Hunting Things).
Though he has died repeatedly, once of a heart attack from old age, the thirty year old still lives on beer, bacon cheeseburgers and pie, a diet suited to him and his life on the road.
Dean saves the world. A lot. Mostly from going dark due to repeat visits to Heaven, Hell and the unknown, so I chose the Vampire Vlad (Dean IRL has been cured of vampirism, so don't worry) to represent him because it reveals a partial truth about the nature of Mr. Winchester.