The short version is that he’s a guy who likes three things: eating lots of food, shooting demons, and being totally extreme and in your face, dude. You get the idea. Despite all of this, there’s more going on beneath his exterior, and you’re going to have to deal with him as you start your leveling in the game. So it’s a chance to peek beneath the surface if you have met him, or just get an idea of who you will be dealing with if you’re not already well acquainted.
Source: Official Site