Sales had lagged enough that Julius Schwartz was brought on board and he brought star artist Carmine Infantino with him. They wanted to emphasize that this was a new era in Batman comics, so they changed the costume by adding a yellow oval behind Batman's bat symbol on his chest. However, that was pretty much it for changes, so it wasn't exactly groundbreaking.
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 want to coordinate their efforts, nor were they asked to do so. Continuity was not important in those days."
The first Batman story, "The Case of the Chemical Syndicate", was published in Detective Comics #27 (May 1939). Finger said, "Batman was originally written in the style of the pulps", and this influence was evident with Batman showing little remorse over killing or maiming criminals. Batman proved a hit character, and he received his own solo title in 1940 while continuing to star in Detective Comics. By that time, Detective Comics was the top-selling and most influential publisher in the industry; Batman and the company's other major hero, Superman, were the cornerstones of the company's success. The two characters were featured side-by-side as the stars of World's Finest Comics, which was originally titled World's Best Comics when it debuted in fall 1940. Creators including Jerry Robinson and Dick Sprang also worked on the strips during this period.
After the success of Batman Begins, Christopher Nolan introduced the world to his quintessential version of Batman in The Dark Knight. Here we initially see the same suit worn in Begins, but then after being mauled by a couple of dogs, Bruce decides he needs a bit more protection and movement. Lucius Fox then introduces him to a new type of armor he’d been working on that had separated plates which gave him greater mobility.
He then decided to form an international group of Bat-operatives called Batman Incorporated. While he was busy setting this up, he let Dick Grayson (who had taken over when he thought Bruce was dead) remain as Batman in Gotham City. He also got a new costume to differentiate himself from Dick's costume. It had a lot of piping and a protruding, glowing yellow oval; future artists tended to tone down almost all of its elements.
As Batman became less of a neck-breaking type of guy, his costume slowly began to look more and more like a typical superhero costume and less like something worn by a guy who was going to break into your house (and maybe break your neck while doing so). Interestingly enough, the cowl took on its standard look within only a few issues after the original costume debuted (roughly around the time that Batman's origin was revealed for the first time in "Detective Comics" #33). The colors then also slowly got bluer over time, until the costume was definitely mostly blue.
In September 2015, DC Entertainment revealed that Finger would be receiving credit for his role in Batman's creation on the 2016 superhero film Batman v Superman: Dawn of Justice and the second season of Gotham after a deal was worked out between the Finger family and DC. Finger received credit as a creator of Batman for the first time in a comic in October 2015 with Batman and Robin Eternal #3 and Batman: Arkham Knight Genesis #3. The updated acknowledgment for the character appeared as "Batman created by Bob Kane with Bill Finger".
The 1993 "Knightfall" story arc introduced a new villain, Bane, who critically injures Batman after pushing him to the limits of his endurance. Jean-Paul Valley, known as Azrael, is called upon to wear the Batsuit during Bruce Wayne's convalescence. Writers Doug Moench, Chuck Dixon, and Alan Grant worked on the Batman titles during "Knightfall", and would also contribute to other Batman crossovers throughout the 1990s. 1998's "Cataclysm" storyline served as the precursor to 1999's "No Man's Land", a year-long storyline that ran through all the Batman-related titles dealing with the effects of an earthquake-ravaged Gotham City. At the conclusion of "No Man's Land", O'Neil stepped down as editor and was replaced by Bob Schreck.