Charlie was a sharp shooter from Scotland, who was an ally to Steve Trevor and Diana.
Charlie is a heavy drinker who first appears losing a bar fight, caused by accidentally taking a sip out of another man's glass. He suffers from PTSD (or, as the Chief puts it, he 'sees ghosts'.) and Sammy appears to be the best at calming him down. Still, he remains generally cheerful if a bit cynical, and enjoys singing and playing the piano.