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.
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
What most people are. Like really. If everybody walked around saying what they really thought shit wouldn't get done!
Dude 1: That's a lovelynew dress Mrs. Beaufort.
Mrs. Beaufort: Why thank you!
Dude 1: **whispers** Makes you look like a whale you fat cow.
Dude 2: Dude, you are such a two-face.
Dude 1: It's true!
Two-Faced is another term of leaving a double life in a negative way. It is usually used when some is being fake like talking trash about their friend when they're not around but when they are, they don't act like this bu tare acting so nice and really cool when they're like snakes.
"Wow, Mickey said Riley's dress is kinda ugly but he can't be rude or he'd hurt her feelings. He is such a two-face"