Characterization

Batman's primary character traits can be summarized as "wealth; physical prowess; deductive abilities and obsession. The details and tone of Batman comic books have varied over the years due to different creative teams. Dennis O'Neil noted that character consistency was not a major concern during early editorial regimes: "Julie Schwartz did a Batman in Batman and Detective and Murray Boltinoff did a Batman in the Brave and the Bold and apart from the costume they bore very little resemblance to each other. Julie and Murray did not coordinate their efforts, did not pretend to, did not want to, were not asked to. Continuity was not important in those days.
The driving force behind Batman's character is from his childhood. Bob Kane and Bill Finger discussed Batman's background and decided that "there's nothing more traumatic than having your parents murdered before your eyes. Despite his trauma, he is driven to train to become a brilliant scientist and train his body into absolute physical perfection to fight crime in Gotham City as Batman, an inspired idea from Wayne's insight into the criminal mind. Another of Batman's characterizations is a vigilante; in order to stop evil that started with the death of his parents, he must sometimes break laws himself. Although manifested differently by being re-told by different artists, it is nevertheless that the details and the prime components of Batman's origin have never varied at all in the comic books, the "reiteration of the basic origin events holds together otherwise divergent expressions". The origin is the source of the character's traits and attributes, which play out in many of the character's adventures.
Batman is often treated as a vigilante by other characters in his stories. Frank Miller views the character as "a dionysian figure, a force for anarchy that imposes an individual order. Dressed as a bat, Batman deliberately cultivates a frightening persona in order to aid him in crime-fighting, a fear that originates from the criminals' own guilty conscience.

Bruce Wayne

In his secret identity, Batman is Bruce Wayne, a wealthy businessman who lives in Gotham City. To the world at large, Bruce Wayne is often seen as an irresponsible, superficial playboy who lives off his family's personal fortune (amassed when his family invested in Gotham real estate before the city was a bustling metropolis) and the profits of Wayne Enterprises, a major private technology firm that he inherits. However, Wayne is also known for his contributions to charity, notably through his Wayne Foundation, a charity devoted to helping the victims of crime and preventing people from becoming criminals. Bruce creates the playboy public persona to aid in throwing off suspicion of his secret identity, often acting dim-witted and self-absorbed to further the act. Among the more noted measures he uses to maintain the facade is pretending he is a heavy drinker by claiming his glasses of ginger ale are strong beverages; Bruce is actually a strict teetotaler to maintain his physical fitness and mental acuity.
Writers of both Batman and Superman stories have often compared the two within the context of various stories, to varying conclusions. Like Superman, the prominent persona of Batman's dual identities varies with time. Modern age comics have tended to portray "Bruce Wayne" as the facade, with "Batman" as the truer representation of his personality (in counterpoint to the post-Crisis Superman, whose "Clark Kent" persona is the 'real' personality, and "Superman" is the 'mask'). In Batman Unmasked, a television documentary about the psychology of the character, Associate Professor of Social Psychology at the University of California, Los Angeles, and an adjunct behavioral scientist at the Rand Corporation Benjamin Karney, notes that Batman's personality is driven by Bruce Wayne's inherent humanity; that "Batman, for all its benefits and for all of the time Bruce Wayne devotes to it, is ultimately a tool for Bruce Wayne's efforts to make the world better".
As noted in the Will Brooker book, Batman Unmasked, "the confirmation of Batman's identity lies with the young audience...he doesn't have to be Bruce Wayne; he just needs the suit and gadgets, the abilities, and most importantly the morality, the humanity. There's just a sense about him: 'they trust him... and they're never wrong.
Finger came up with the name "Bruce Wayne" for the superhero's secret identity. In Jim Steranko's History of the Comics, vol. 1, Bill Finger reveals, "Bruce Wayne's first name came from Robert Bruce, the Scottish patriot. Wayne, being a playboy, was a man of gentry. I searched for a name that would suggest colonialism. I tried Adams, Hancock...then I thought of Mad Anthony Wayne."
In T. James Musler's book Unleashing the Superhero in Us All, he explores the extent to which money is important in Bruce Wayne's life.

Dick Grayson

While Wayne traveled through time to get back to the present, Dick Grayson became the new Batman. This was the second time he had taken on the mantle in Bruce Wayne's absence, albeit the first time (when Wayne was recovering from his broken back) reluctantly. After Wayne's "death", Dick stated that he had no problem becoming Batman, but Wayne had left a prerecorded message telling him not to take up the mantle and to continue fighting crime as Nightwing with Robin at his side. Realizing that Gotham still needed the Dark Knight, Dick retired his Nightwing mantle to become the new Batman. With Wayne's return and plans to launch Batman worldwide, Dick remained the Batman of Gotham City. After the events of Flashpoint, Dick will return to being Nightwing.
In an interview with IGN, Morrison details that having Grayson as Batman and Damian Wayne as Robin will be a "reverse" of the normal dynamic between Batman and Robin, with, "a more light-hearted and spontaneous Batman and a scowling, badass Robin." Morrison explains his intentions for the new characterization of Batman: "Dick Grayson is kind of this consummate superhero. The guy has been Batman's partner since he was a kid, he's led the Teen Titans, and he's trained with everybody in the DC Universe. So he's a very different kind of Batman. He's a lot easier; He's a lot looser and more relaxed.