Sitting underneath a chandelier with its light bulbs screwed into metal bats, Ozzy Osbourne — the self-proclaimed "Prince of Fuckin' Darkness" — explains how he became a character in Guitar Hero: World Tour. "They wanted somebody people could relate to," says the man who once snorted a line of ants just to see what would happen.

To say that Osbourne is an unlikely video-game star would be an understatement. He admits he doesn't play at all, although he fondly remembers Pong,...