Kathy Kane (Batwoman): First introduced as a female counterpart for Batman, Batwoman developed into a romantic partner in the Silver Age, where many Imaginary Stories featuring Kathy and Bruce getting married were published. Batwoman's love for Batman was never reciprocated and he only saw her as a good friend. On Earth-Two, Batwoman resigned to live without Batman's love, and in the Earth-One continuity, Kathy Kane was murdered by the League of Assassins. In the New Earth continuity, Kathy Kane was romantically interested in Batman in a couple of stories by Grant Morrison, who liked to use Silver Age content as reference in his works.
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."
DC's 2005 limited series Identity Crisis, reveals that JLA member Zatanna had edited Batman's memories, leading to his deep loss of trust in the rest of the superhero community. Batman later creates the Brother I satellite surveillance system to watch over the other heroes. Its eventual co-opting by Maxwell Lord is one of the main events that leads o the Infinite Crisis miniseries, which again restructures DC continuity.
The New Earth version of Julie was slightly changed from her previous counterparts. In this version, Julie had auburn hair instead of black and she was the daughter of Norman Madison, a wealthy entrepreneur. She started a relationship with Bruce, but when she learned that he was Batman and that her father was killed as a result of Batman's actions, she left Gotham and her relationship with Bruce, choosing to become a missionary in Africa.
Diana and Bruce briefly dated but nothing came of their relationship and the two decided it would be best to remain friends. However, they still care deeply about one another, and this is evidenced by Wonder Woman's love for Batman allowing her to become a member of the Star Sapphire Corps in Blackest Night. Their relationship is echoed in the Justice League Animated Series, where producers decided to pair Diana with Bruce.
DC Comics' 2005 limited series Identity Crisis reveals that JLA member Zatanna had edited Batman's memories to prevent him from stopping the Justice League from lobotomizing Dr. Light after he raped Sue Dibny. Batman later creates the Brother I satellite surveillance system to watch over and, if necessary, kill the other heroes after he remembered. The revelation of Batman's creation and his tacit responsibility for Blue Beetle's death becomes a driving force in the lead-up to the Infinite Crisis miniseries, which again restructures DC continuity. Batman and a team of superheroes destroy Brother Eye and the OMACs, though, at the very end, Batman reaches his apparent breaking point when Alexander Luthor Jr. seriously wounds Nightwing. Picking up a gun, Batman nearly shoots Luthor in order to avenge his former sidekick, until Wonder Woman convinces him to not pull the trigger.
Batman quickly goes to the GCPD headquarters, where the Joker's latest attack took place. Previously, he had defeated the Joker and sent him to prison, where an unnamed person surgically removed his face. Later at the Batcave, Batman runs several traces for on previously collected samples of Joker Venom to see if any was found on the scene at police headquarters. As several of Batman's allies call, offering assistance in taking down the Joker, Batman declines, saying that whatever the Joker is planning, it is between him and Batman. In that moment, the Joker broadcasts a message on live TV, saying that he will kill Mayor Hady. The GCPD reinforces the City Hall to protect the Mayor, but the Joker poisons all the cops and security guards, leaving Batman, Commissioner Gordon and the Mayor as the only survivors. Batman investigates the chemical compounds used on the cops and finds three additional non-active chemicals: Aspirin, Chlorine, and Ethane. A, C, E. Batman realizes that the Joker is sending him back where it all started; to A.C.E. Chemicals. There, he finds a person dressed as the Red Hood. Batman is aware that the mysterious stranger is not the Joker, but suddenly, he is knocked aside by a giant wooden mallet. Batman falls into an empty chemical vat, while the stranger reveals herself as Harley Quinn. A chemical bath begins to pour into the vat, while Harley proclaims that the Joker is planning something not even she can comprehend.
Kane signed away ownership in the character in exchange for, among other compensation, a mandatory byline on all Batman comics. This byline did not originally say "Batman created by Bob Kane"; his name was simply written on the title page of each story. The name disappeared from the comic book in the mid-1960s, replaced by credits for each story's actual writer and artists. In the late 1970s, when Jerry Siegel and Joe Shuster began receiving a "created by" credit on the Superman titles, along with William Moulton Marston being given the byline for creating Wonder Woman, Batman stories began saying "Created by Bob Kane" in addition to the other credits.
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.