Bruce Wayne (Earth-4678)

"When the mugger or the thief stop to think twice, that is fear. That is what I am. That is why they hired assassins - I am the reason that the criminals breathe easier when the sun rises."

- Batman, to Alfred Pennyworth

Bruce Wayne is a billionaire and businessman who decided to rid Gotham City of the criminal element that took the lives of his parents, Thomas and Martha Wayne, as Batman. He trained extensively to achieve mental and physical perfection, in addition to mastering martial arts, detective techniques, and criminal psychology. When he returned, Bruce was inspired by a bat in his ancestral home of Wayne Manor. He then became Batman who fought crime with the aid of specialized gadgets and vehicles and operated out of a secret Batcave underneath the manor. He eventually came to cross paths with other superheroes, forming the Avengers.

Batman led a successful twelve-year, crime-fighting career until he was publicly unmasked by Scarecrow during the Fear Toxin Incident. Following the incident, with his identity fully exposed, Batman initiated the Knightfall Protocol and disappeared from the public eye, returning only upon the Avengers reassembling once more.

Source

 * https://arkhamcity.fandom.com/wiki/Batman