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.
Peak Human Reflexes: Batman's reflexes are seemingly superhuman, and is far superior to normal humans. He is able to quickly react to instantaneously to simultaneous attacks from multiple enemies and dodge rapid gunfire at point-blank range, though he can get hit if there are to many to evade. Bruce's reflexes were honed to such a degree that he has caught one of Green Arrow's arrows in mid flight from behind when he tried to shoot him. Bruce himself mentally stated in mid-combat that he perceives bullets in slow motion. He has also caught a grenade and threw it back at the enemy and caught a speeding baseball at the last moment.
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.
After a new supervillain called Mr. Bloom apparently killed Gordon and took over Gotham, Bruce learnt about his life as Batman and, after talking to a stranger, returned to the Batcave for the first time since his final encounter with Joker. However, unable to recover the skills required to fight Bloom and his underlings, he decided to use an experimental machine that would upload his memories and skills into a body, but at the cost of his new life. With help from Alfred and Julie (who had discovered the truth long ago), Bruce went through with the procedure and returned to Gotham as Batman. With help from Gordon and a street gang modeled after Robin, he was able to defeat Bloom and save the city once again.
The famous Bronze Age Batman costume is a lot like the Golden Age costume in the sense that neither of them were technically what you would call "new" costumes. However, they so drastically altered the look of Batman's costume from what came before that it would be ridiculous not to consider them costume changes. When Neal Adams began drawing Batman in the early 1970s, the costume he was drawing was ostensibly the "New Look" costume, but Neal Adams streamlined the costume dramatically.
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. Miller is often credited with reintroducing anti-heroic traits into Batman's characterization, such as his brooding personality, willingness to use violence and torture, and increasingly alienated behavior. Batman, shortly a year after his debut and the introduction of Robin, was changed in 1940 after DC editor Whitney Ellsworth felt the character would be tainted by his lethal methods and DC established their own ethical code, subsequently he was retconned as having a stringent moral code. Miller's Batman was closer to the original pre-Robin version, who was willing to kill criminals if necessary.