Batman is at times a member of superhero teams such as the Justice League of America and the Outsiders. Batman has often been paired in adventures with his Justice League teammate Superman, notably as the co-stars of World's Finest and Superman/Batman series. In pre-Crisis continuity, the two are depicted as close friends; however, in current continuity, they are still close friends but an uneasy relationship, with an emphasis on their differing views on crime-fighting and justice. In Superman/Batman #3 (Dec. 2003), Superman observes, "Sometimes, I admit, I think of Bruce as a man in a costume. Then, with some gadget from his utility belt, he reminds me that he has an extraordinarily inventive mind. And how lucky I am to be able to call on him."
Linda Page: A character adapted from the Batman serial (1943), Linda Page was introduced into the comics during the Golden Age as a romantic partner for Bruce Wayne. A former socialite, she dedicated her time as a nurse for the elderly, disproving the stereotype that rich women were spoiled and lazy. She dated Bruce for a few issues, but later fell between the cracks and disappeared.
In an early 1980s storyline, Selina Kyle and Bruce Wayne develop a relationship, in which the closing panel of the final story shows her referring to Batman as "Bruce". However, a change in the editorial team brought a swift end to that storyline and, apparently, all that transpired during the story arc. Out of costume, Bruce and Selina develop a romantic relationship during The Long Halloween. The story shows Selina saving Bruce from Poison Ivy. However, the relationship ends when Bruce rejects her advances twice; once as Bruce and once as Batman. In Batman: Dark Victory, he stands her up on two holidays, causing her to leave him for good and to leave Gotham City for a while. When the two meet at an opera many years later, during the events of the twelve-issue story arc called "Hush", Bruce comments that the two no longer have a relationship as Bruce and Selina. However, "Hush" sees Batman and Catwoman allied against the entire rogues gallery and rekindling their romantic relationship. In "'Hush", Batman reveals his true identity to Catwoman.
Later, Batman investigates the office of Thomas Elliot and discovers one of his patients was someone called Arthur Wynne who sought an operation for an inoperable brain tumor. Nightwing and Catwoman investigate a graveyard break-in and are attacked by the Scarecrow. Nightwing is overpowered by the fear toxin, but Catwoman defeats Scarecrow and gets Nightwing to safety. However, she is captured by Hush after Nightwing escapes.
The end result was a character who looked like he would fit right along famous pulp heroes like the Shadow, with a distinct-looking cowl and a cape that still managed to maintain some of its wing-like approach. This was the type of character that you would take one glance at and think, "Yeah, this dude wouldn't mind snapping a neck or two to get the job done." That fit the early style of Batman stories perfectly.
Natalya Trusevich: A Ukrainian concert pianist and girlfriend of Bruce Wayne, Natalya grew frustrated with Bruce's closed-off demeanour, until he was urged by Alfred to reveal to her his secret identity. Shortly after, Natalya was abducted by the Mad Hatter who attempted to torture her into revealing the identity of Batman. Natalya refused to divulge Bruce's secret and was thrown by the Mad Hatter from a helicopter to her death.