Julie Madison, Batman's first love interest, passed herself off as Robin briefly in Detective Comics #49 (March 1941). In this issue, Batman and Robin intervene when Clayface escapes from custody and goes after Julie. In the course of capturing the villain, she becomes the first female to don the Robin costume as part of a complicated deception.
Originally, Batman's vehicle was a red convertible without any special functions. The car's design evolved gradually. It began featuring an ever-larger bat hood ornament and an ever-darker paint job. Eventually, the predominant designs included a large, dark-colored body and bat-like accessories, including large tailfins scalloped to resemble a bat's wings.
While Victor Zsasz was trying to commit suicide by jumping from Gotham Bridge, a homeless man assaulted him with a knife. Instinctively grabbing the knife, Zsasz saw in the man's eyes that all life is meaningless and that nothing nor anyone matters. He then proceeded to stab the man to death as a "gift" for saving his life. From then on, he dedicated himself to "liberating" others from their pointless existence.