Bill Finger in the context of "Batgirl"

Batman is a superhero who appears in American comic books published by DC Comics. Batman 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, Batman is the alias of Bruce Wayne, a wealthy American playboy, philanthropist, and industrialist who resides in the fictional Gotham City. His origin story features him swearing vengeance against criminals after witnessing the murder of his parents, Thomas and Martha, as a child, a vendetta tempered by 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 and James Gordon; love interest and occasional adversary Catwoman; as well as foes such as the Penguin, the Riddler, Two-Face, and his archenemy, the Joker.

Kane conceived Batman in early 1939 to capitalize on the popularity of Superman; although Kane frequently claimed sole creation credit, Finger substantially developed the concept from a generic superhero into something more bat-like. They drew inspiration from pulp fiction characters like the Shadow, Sherlock Holmes, and the Green Hornet. Batman received a spin-off publication, Batman, in 1940. Kane and Finger introduced Batman as a ruthless vigilante who frequently killed or maimed criminals, but he evolved into a just, tempered superhero with a stringent moral code that prohibits killing during the 1940s. Unlike most superheroes, Batman does not possess any superpowers, instead relying on his intellect, fighting skills, and wealth. The 1960s Batman television series used a camp aesthetic, which continued to be associated with Batman for years after it ended. Various creators worked to return Batman to his darker roots in the 1970s and 1980s, culminating with the 1986 miniseries The Dark Knight Returns by Frank Miller.

Green Lantern is the name of several superheroes appearing in American comic books published by DC Comics. They fight evil with the aid of rings that grant them a variety of extraordinary powers, all of which come from imagination, fearlessness, and the electromagnetic spectrum of emotional willpower. The characters are typically depicted as members of the Green Lantern Corps, an intergalactic law enforcement agency.

The first Green Lantern character, Alan Scott, was created in 1940 by Martin Nodell with scripting or co-scripting of the first stories by Bill Finger during the Golden Age of Comic Books and usually fought common criminals in Capitol City (and later, Gotham City) with the aid of his magic ring. For the Silver Age of Comic Books, John Broome and Gil Kane reinvented the character as Hal Jordan in 1959 and introduced the Green Lantern Corps, shifting the nature of the character from fantasy to science fiction. During the Bronze Age of Comic Books, Dennis O'Neil and Neal Adams introduced John Stewart, a new member of the Corps who was one of DC's first Black superheroes. Other notable Green Lanterns include Guy Gardner, Kyle Rayner, Simon Baz, Jessica Cruz and Jo Mullein.

Gotham City (/ˈɡɒθəm/ GOTH-əm), or simply Gotham, is a fictional city in the Northeastern United States that serves as the primary city appearing in American comic books published by DC Comics. It is best known as the home of the superhero Batman and his allies and foes. Created by writer Bill Finger and artist Bob Kane, the city was first identified as Batman's place of residence in Batman #4 (December 1940) and has since been the primary setting for stories featuring the character. In most of its incarnations, Gotham is depicted as one of the most crime-ridden cities in the world.

Gotham City is traditionally depicted as being located in the U.S. state of New Jersey. Gotham's look and atmosphere were primarily influenced by New York City, but over the years have drawn inspiration from Chicago and London as well. Architect Hugh Ferriss' designs also influenced the look and emotional feel of Gotham City, particularly in its later depictions. Bill Finger said that he chose the name "Gotham", and not New York, so that all readers in any city could identify with it.

Robin is the alias of several superheroes appearing in American comic books published by DC Comics. The character was created by Bob Kane, Bill Finger, and Jerry Robinson to serve as a junior counterpart and the sidekick to the superhero Batman. As a team, Batman and Robin have commonly been referred to as the Caped Crusaders and the Dynamic Duo. The character's first incarnation, Dick Grayson, debuted in Detective Comics #38 (April 1940). Conceived as a way to attract young readership, Robin garnered overwhelmingly positive critical reception, doubling the sales of the Batman titles. Robin's early adventures included Star Spangled Comics #65–130 (1947–1952), the character's first solo feature. He made regular appearances in Batman-related comic books and other DC Comics publications from 1940 through the early 1980s, until the character set aside the Robin identity and became the independent superhero Nightwing.

The character's second incarnation, Jason Todd, first appeared in Batman #357 (1983). He made regular appearances in Batman-related comic books until 1988, when he was murdered by the Joker in the storyline "A Death in the Family". Jason was resurrected following a reality-changing incident, eventually becoming the Red Hood. The premiere Robin limited series was published in 1991, featuring the character's third incarnation, Tim Drake, training to earn the role of Batman's vigilante partner. After two successful sequels, the monthly Robin series began in 1993 and ended in early 2009, which also helped his transition from sidekick to a superhero in his own right. In 2004 storylines, established DC Comics character Stephanie Brown became the fourth Robin for a short time before the role reverted to Tim Drake. Damian Wayne succeeds Drake as Robin in the 2009 story arc "Battle for the Cowl."

James W. "Jim" Gordon Sr. is a character appearing in American comic books published by DC Comics, most commonly in association with the superhero Batman. Created by Bill Finger and Bob Kane as an ally of Batman, the character debuted in the first panel of Detective Comics #27 (May 1939), Batman's first appearance, making him the first Batman supporting character ever to be introduced.

As the police commissioner of Gotham City, Gordon shares Batman's deep commitment to ridding the city of crime. The character is typically portrayed as having full trust in Batman and is even somewhat dependent on him. In many modern stories, he is somewhat skeptical of Batman's vigilante methods, but nevertheless believes that Gotham needs him. The two have a mutual respect and tacit friendship. Gordon is the biological or adoptive father (depending on the continuity) of Barbara Gordon, the second Batgirl and the information broker Oracle. Jim Gordon also has a biological son, James Gordon Jr., a psychopathic serial killer who first appeared in Batman: Year One (as an infant).

Catwoman is a character appearing in American comic books published by DC Comics. Created by Bill Finger and Bob Kane, she debuted as "the Cat" in Batman #1 (spring 1940). She has become one of the superhero Batman's most prominent enemies, belonging to the collective of adversaries that make up his rogues gallery, as well as Batman's best known and most enduring love interest, with many stories depicting their complex love–hate relationship. Since 1993, Catwoman has had her own ongoing series, Catwoman.

Catwoman is the alter ego of Selina Kyle, a burglar in Gotham City who usually wears a skintight bodysuit and uses a bullwhip for a weapon. She was originally characterized as a supervillain and adversary of Batman, but has been featured in an eponymous series since the 1990s that portrays her as an antiheroine, often with a utilitarian moral philosophy. The character thrived in her earliest appearances, but she took an extended hiatus from September 1954 to November 1966 due to the developing Comics Code Authority in 1954. These issues involved the rules regarding the development and portrayal of female characters that were in violation of the Comics Code, a code which is no longer in use. In the comics, Holly Robinson and Eiko Hasigawa have both adopted the Catwoman identity, apart from Selina Kyle.

The Penguin (Oswald Chesterfield Cobblepot) is a fictional character appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. The character made his first appearance in Detective Comics #58 (December 1941) and was created by Bob Kane and Bill Finger. The Penguin is one of Batman's most enduring enemies and belongs to the collective of adversaries that make up Batman's rogues gallery. The Penguin has repeatedly been named one of the best Batman villains and one of the greatest villains in comics. The Penguin was ranked #51 in IGN's list of the Top 100 Comic Book Villains of All Time.

The Penguin is a Gotham City mobster who fancies himself the number one "Gentleman of Crime". He is most often seen as a short, fat man with a long nose who wears a monocle, top hat, and morning suit while carrying his signature umbrella. He also has a cigarette holder in his mouth. The Penguin uses high-tech umbrellas as different tools. His umbrellas have been used as guns, gas sprayers, swords/knives, a mini-helicopter and many other unconventional tools. The Penguin owns and runs a nightclub called the Iceberg Lounge which provides a cover for his criminal activity.

The Riddler (Edward Nigma, later Edward Nygma or Edward Nashton) is a supervillain appearing in American comic books published by DC Comics. The character was created by Bill Finger and Dick Sprang, and debuted in Detective Comics #140 in October 1948. He has become one of the most enduring enemies of the superhero Batman and belongs to the collective of adversaries that make up his rogues gallery.

In his comic book appearances, the Riddler is depicted as a criminal mastermind in Gotham City. He has an obsessive compulsion to incorporate riddles, puzzles, and death traps in his schemes to prove his intellectual superiority over Batman and the police. His real name—Edward Nigma—is a pun itself; an "enigma" is a person or thing that is difficult to understand. With this self-conscious use of an elaborate gimmick, the Riddler's crimes are often theatrical and ostentatious. The character commonly wears a domino mask and either a green unitard decorated with question mark prints or a green suit and bowler hat. A black, green, or purple question mark serves as his visual motif. He commonly says "Riddle me this", before stating his iconic riddles.