Coined by Larry Rodney for his comic strip of the same name. Charisma Man was the alter ego of a typical western man in Japan. Because of this strip it has come into common usage by many westerners in Japan, and has spread to similar countries like Korea.
A charisma man is typically a western male in an Asia country who enjoys unexpected popularity, particularly if he was nothing special in his home country.
From Charisma Man comic strip, "Back on his home planet of Canada our hero was just another average guy, but when he landed on planet Japan he became Charisma Man. But can our hero defend himself against his arch-enemy Western Woman!?"