Richard "Dick" Grayson is a superhero appearing in American comic books published by DC Comics, commonly in association with Batman, Teen Titans and Justice League. Created by writer Bill Finger and artist Bob Kane, he first appeared in Detective Comics #38 in April 1940 as the original and most popular incarnation of Robin, Batman's crime-fighting partner. He is also the oldest child of Bruce Wayne, Batman's alter ego, being the first child to be adopted by Batman. In Tales of the Teen Titans #44, the character, after becoming a young adult, retires his role as Robin and assumes the superhero persona of Nightwing. Grayson has donned the cape and cowl to replace Bruce Wayne as Batman. His most notable spell as Batman followed Bruce Wayne's supposed death in Final Crisis, and sees Grayson adopt Damian Wayne, Bruce's biological son and his adoptive younger brother, as his Robin.

Batman is a superhero appearing in American comic books published by DC Comics. The character was created by artist Bob Kane and writer Bill Finger, and debuted in the 27th issue of the comic book Detective Comics on March 30, 1939. In the DC Universe continuity, Batman is the alias of Bruce Wayne, a wealthy American playboy, philanthropist, and industrialist who resides in Gotham City. Batman's origin story features him swearing vengeance against criminals after witnessing the murder of his parents Thomas and Martha as a child, a vendetta tempered with the ideal of justice. He trains himself physically and intellectually, crafts a bat-inspired persona, and monitors the Gotham streets at night. Kane, Finger, and other creators accompanied Batman with supporting characters, including his sidekicks Robin and Batgirl; allies Alfred Pennyworth, James Gordon, and Catwoman; and foes such as the Penguin, the Riddler, Two-Face, and his archenemy, the Joker.