Sentient machine, with external appearance is that of a metallic human with face lacking most features common to other races. Lacking a mouth—a mechanical voice generator in their torso produces their emotionless voice.  13578802 looks like most other of the citizens from Mechanos.  As an additional symbol of individuality, 13578802 procured a set of Earthling "Rocketeer Wings" and affixed them to his torso much like the adornment on Earthling Flight Jackets.