Batman
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.
Bob Kane
The character debuted in "Detective Comics" #27 (May 1939) and proved a breakout hit. Within a year, Kane hired art assistants Jerry Robinson (initially as an inker) and George Roussos (backgrounds artist and letterer). Though Robinson and Roussos worked out of Kane's art studio in "The New York Times" building, Kane himself did all his drawing at home. Shortly afterward, when DC wanted more Batman stories than Kane's studio could deliver, the company assigned Dick Sprang and other in-house pencilers as "ghost artists", drawing uncredited under Kane's supervision. Future "Justice League" writer Gardner Fox wrote some early scripts, including the two-part story "The Monk" that introduced some of The Batman's first "Bat-" equipment.