Gotham City in the context of "Arkham Asylum"

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.

Metropolis is a fictional city appearing in American comic books published by DC Comics, best known as the home of Superman and his closest allies and some of his foes. First appearing by name in Action Comics #16 (Sept. 1939), Metropolis is depicted as a prosperous and massive city in the Northeastern United States, in close proximity to Gotham City. In recent years, it has been stated to be located in New York.

The co-creator and original artist of Superman, Joe Shuster, modeled the Metropolis skyline after Toronto, where he was born and lived until he was ten. Since then, however, the look and feel of Metropolis has been greatly influenced by New York City.

Dr. Thomas Wayne, M.D. is a fictional character appearing in American comic books published by DC Comics. He is the father of Bruce Wayne (Batman), and husband of Martha Wayne as well as the paternal grandfather of Damian Wayne. Wayne was introduced in Detective Comics #33 (November 1939), the first exposition of Batman's origin story. A gifted surgeon and philanthropist to Gotham City, Wayne inherited the Wayne family fortune after Patrick Wayne. When Wayne and his wife are murdered in a street mugging, Bruce is inspired to fight crime in Gotham as the vigilante Batman.

Wayne was revived in Geoff Johns' alternate timeline comic Flashpoint (2011), in which he plays a major role as a hardened, more violent version of Batman, whose son was killed instead of his wife and himself, leading both of them to become the altered reality's counterparts of Batman and the Joker respectively, and dies again by the end of the storyline. Dr. Wayne returned to the main DC Universe in DC Rebirth, as a revived amalgamation of his original self killed by Joe Chill and his Flashpoint Batman self killed in "The Button", teaming up with the supervillain Bane to attempt to force his son to retire as Batman.

The Batman supporting characters are fictional characters that appear in the American comic books published by DC Comics featuring the superhero Batman as the main protagonist.

"Batman family" or "Bat-Family" is the informal term for Batman's closest allies, who are mainly masked vigilantes operating in Gotham City. Since the Bat-Family's introduction in 1939, Batman has accumulated a number of recognized supporting characters. The first Batman supporting character was Commissioner James "Jim" Gordon, Batman's ally in the Gotham City Police Department, who first appeared with Batman in Detective Comics #27 (May 1939). Some of the other allies of Batman include his vigilante partner, Robin, who was introduced in 1940; his butler, Alfred Pennyworth, who was introduced in 1943; and Barbara Gordon, who was introduced in 1967.

Batgirl is the name of several superheroines appearing in American comic books published by DC Comics, depicted as female counterparts and allies to the superhero Batman. The character Betty Kane was introduced into publication in 1961 by Bill Finger and Sheldon Moldoff as Bat-Girl, and was replaced in 1967 by Barbara Gordon, who became the most iconic Batgirl. The character debuted in Detective Comics #359 (January 1967) by writer Gardner Fox and artist Carmine Infantino, introduced as the niece/adoptive daughter of police commissioner James Gordon.

Batgirl operates in Gotham City, allying herself with Batman and the original Robin, Dick Grayson, along with other masked vigilantes. The character appeared regularly in Detective Comics, Batman Family, and several other books produced by DC until 1988. That year, Barbara Gordon appeared in Barbara Kesel's Batgirl Special #1, in which she retires from crime-fighting. She subsequently appeared in Alan Moore's graphic novel Batman: The Killing Joke where, in her civilian identity, she is shot by the Joker and left paraplegic. Although she is reimagined as the computer expert and information broker Oracle by editor Kim Yale and writer John Ostrander the following year, her paralysis sparked debate about the portrayal of women in comics, particularly violence depicted toward female characters.

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.