The first thing anyone should know about Vin Diesel, AKA Mark Sinclaire Vincent, is that he is a huge Dungeons and Dragons nerd. The actor admitted with charming self-deprecation that he has been a fan of the game for over two decades. It is hard to imagine Riddick pretending to be a dwarf mage, but somewhat sweet and unique at the same time.

Born in New York City 41 years ago, Vin is biracial and was raised by his stepfather and mother with his three siblings. His mixed racial origins came back in a big way early in his career when Vin wrote, directed, and starred in a film called "M...