The lieutenant has a prominent mustache and sideburns, sharing the same face as the Gunman. He wears a tricorne hat with a red plume sticking out of it. Otherwise, he wears the standard Royal Navy redcoat uniform as other imperial soldiers in the 2009 Pirates theme.
The lieutenant is an elite officer that appears on the Imperial Flagship. Since the ship is captained by Governor Tierney, the lieutenant is most likely his second-in-command.