"Once Harvey Dent, District Attorney of Gotham City and an ally of Batman, he goes insane and becomes the crime boss Two-Face after the left half of his face is hideously disfigured; he chooses to bring about good or evil based upon the outcome of a coin flip."
"Originally, Two-Face was one of many gimmick-focused comic book villains, plotting crimes based around the number two, such as robbing Gotham Second National Bank at 2:00 on February 2. In his autobiography, Batman creator Bob Kane claims to have been inspired by Robert Louis Stevenson's Strange Case of Dr Jekyll and Mr Hyde, specifically the 1931 film Dr. Jekyll and Mr. Hyde which he saw as a boy. Kane had not read the novel when he and Bill Finger created Two-Face. Some inspiration was also derived from The Black Bat whose origin story included being splashed with acid across his face."