Bruce Wayne

Bruce Wayne is a billionare playboy, but also secretly the vigilante Batman.

A young Bruce fell into a hole (later the Batcave) and it was filled with bats. His father, Thomas, rescued him, and Bruce was since then afraid of bats. Then Thomas and Martha Wayne were murdered right in front of him.

A older Bruce then went into the Batcave to face his fears. Then he became Batman because he was afraid of bats and he wanted crimanals to share his dread.

At the end of The Dark Knight, Batman says he killed many people so the Joker can't win.