The Joker's Father

The Joker's father was, according to The Joker "a drunk and a fiend".

Biography
The Joker claimed that his father gave him his cheek scars. It is unverifiable if this is true, as The Joker also gave an account of inflicting the cuts himself.

The Joker also remarked that a man reminded him of his father, whom he hated.

Appearances

 * The Dark Knight (mentioned only)