You never really see the figure known as Grit unless he wants you to, and it's very unlikely that he does. In the event that he lets you catch a glimpse, you might see a heavy set, tall figure wrapped in something somewhere between a robe, a coat, or even the bandages of an Egyptian Mummy. Other faint indicators of his presence include a slight feeling of damp in the air, and a faint unpleasant smell of chemicals and rot.