Since I want to play as a Titan, I'd want a Heavy machine gun. Heavy, as in firing specially designed 14mm Depleted Uranium rounds. It would have a rounded body shape, and the kind of trigger/handle set up that you see on the miniguns that people carry. (Upwards facing handle, trigger on the top on the index finger.) At the front, it would have three, very large rotating barrels, and at the beginning of these barrels, would be the same kind of holes that you would see in a browning .30 cal from World War 2. The end of these barrels would have the same triangular fitting that is on the warthog machine gun from Halo. It would have a strap made of brown leather-like material that you would sling over your shoulder in order to help you carry it. You would put one hand on the handle, and the other on a grip that stuck out horizontally, and then vertically, on the left side of the gun. The rounds would fire out of the bottom barrel, rather than the top, so it had a more centralized- fire kind of feel. Basically, just a large caliber, multi-spinning-barrel gun with a slow firate rate, but devestating power.