One of Batman's oldest foes, and one of
Bruce Wayne's oldest friends. His first appearance was in Detective Comics #66, in 1942.
He was once Harvey Dent, the youngest District Attorney in
Gotham City's history. However, Salvatore "Boss"
Maroni threw acid in his face during a trial, which hideously scarred him and fractured his psyche.
Now known as Two-Face, he has developed an obsession with duality and chance, basing his crimes around the number two, and deciding outcomes of life or death with a flip of his two headed coin, which like him, is scarred on one side.
Example:
From the private notes of Dr. Hugo Strange
Two-Face is obsessed with
duality, and determined to recruit
half the population of
Arkham City in preparation for a bloody war against the other gangs within Arkham City. But his strategy starts and ends with a flip of his coin, adding an element of randomness to his every move.
"The world is cruel, and the only morality in a cruel world is chance. Unbiased, unprejudiced, fair."-Harvey Dent/Two-Face