Well over 6 feet tall and covered in coppery metal, this Warforged is unusually lean and gaunt. His limbs are out of proportion to his body. Copper is often seen carrying burlap sacks of scrap metal, garbage he's collected from the tunnels of Blackbones.
Ash describes Copper as simple-minded, and particularly afraid of whatever is causing the murders in KA25. Murder in Blackbones, Part I. When speaking to Copper, all the party get out of him are the ravings of a madman ("It's tearing us apart", "It exposes our flaws!")