Question: Bullseye is a character who has a vendetta against the superhero appearing in comics by which company?

Documents:
source: Bullseye (comics)
text: Bullseye (comics) Bullseye (Lester) is a fictional character appearing in American comic books published by Marvel Comics. A psychopathic assassin, Bullseye uses the opportunities afforded by his line of work to exercise his homicidal tendencies and to work out his own personal vendetta against Daredevil.

source: Daredevil (Marvel Comics character)
text: Daredevil (Marvel Comics character) Daredevil is a fictional superhero appearing in American comic books published by Marvel Comics. Daredevil was created by writer-editor Stan Lee and artist Bill Everett, with an unspecified amount of input from Jack Kirby. The character first appeared in "Daredevil" #1 (April 1964). Writer/artist Frank Miller's influential tenure on the title in the early 1980s cemented the character as a popular and influential part of the Marvel Universe. Daredevil is commonly known by such epithets as the "Man Without Fear" and the "Devil of Hell's Kitchen".

source: Lady Bullseye
text: Lady Bullseye Lady Bullseye is a fictional character, a supervillainess in the Marvel Comics Universe . A female counterpart of Bullseye, she was created by Ed Brubaker, Marko Djurdjevic, and Clay Mann, first appearing in "Daredevil" #111. She has primarily been an opponent of the superhero Daredevil.

source: Charlton Bullseye (comics)
text: Charlton Bullseye (comics) Charlton Bullseye was the title of a short-lived Charlton Comics showcase comic book series published from June 1981 through December 1982. Several new stories using Charlton's "Action Heroes" appeared, before they were sold to DC Comics in 1983. After the cancellation of "Charlton Bullseye", stories intended for the title were published in "Scary Tales" #36–40, which explains the superhero story "Mr. Jigsaw" in issue #38 and "Dragon Force" in issue #40. Several other unpublished stories for the title were published by AC Comics.

source: Roy Harper (comics)
text: Roy Harper (comics) Roy Harper is a fictional superhero appearing in American comic books published by DC Comics. Roy is one of DC's most longstanding characters, originating in 1940s comics as Speedy, the teen sidekick of the superhero Green Arrow. Like his mentor Green Arrow, Roy is a world-class archer and athlete who uses his exceptional marksmanship to fight crime. Along with other prominent DC Comics superhero sidekicks, he goes on to become a core member of the superhero group the Teen Titans. As an adult, Roy casts off his Speedy identity to establish himself as the superhero Arsenal, and for a time adopts the name Red Arrow to symbolise his having become an equal of Green Arrow. As well as continuing to serve as one of the Titans at various times, Roy has had leading roles in the superhero groups the Seven Soldiers of Victory, the Outsiders, the Justice League, and the Outlaws.

source: Barbara Gordon
text: Barbara Gordon Barbara Gordon is a fictional superhero appearing in American comic books published by DC Comics, commonly in association with the superhero Batman. The character was created by William Dozier, Julius Schwartz, and Carmine Infantino. At the request of the producers of the 1960s "Batman" television series, DC editor Schwartz called for a new female counterpart to the superhero Batman that could be introduced into publication and the third season of the show simultaneously. The character subsequently made her first comic book appearance as Batgirl in "Detective Comics" #359, titled "The Million Dollar Debut of Batgirl!" (January 1967), by writer Gardner Fox and artist Carmine Infantino.

source: Falcon (comics)
text: Falcon (comics) Falcon (Samuel Thomas "Sam" Wilson) is a fictional superhero appearing in American comic books published by Marvel Comics. Created by writer-editor Stan Lee and artist Gene Colan, and introduced in "Captain America" #117 (Sept. 1969), the character is mainstream comics' first African-American superhero. As the superhero Falcon, Wilson uses mechanical wings to fly, granting him limited telepathic and empathic control over birds. Following Steve Rogers' retirement, Wilson becomes the newest Captain America and leader of the Avengers. A similar, unrelated character of the same name and powers was created in 1939 by writer-artist Bill Everett for Marvel Comics' predecessor company, Timely Comics.

source: Charlton Bullseye (fanzine)
text: Charlton Bullseye (fanzine) The Charton Bullseye was a fanzine published from 1975-76 by the CPL Gang highlighting Charlton Comics. It was a large format publication, with color covers on card stock and black & white interiors. "Charton Bullseye" published several previously unpublished Charlton superhero and adventure stories, along with articles on Charlton comics, news, reviews, pinups, and more.

source: Superman
text: Superman Superman is a fictional superhero appearing in American comic books published by DC Comics. The character was created by writer Jerry Siegel and artist Joe Shuster, high school students living in Cleveland, Ohio, in 1933. They sold Superman to Detective Comics, the future DC Comics, in 1938. Superman debuted in "Action Comics" #1 (cover-dated June 1938) and subsequently appeared in various radio serials, newspaper strips, television programs, films, and video games. With this success, Superman helped to create the superhero archetype and establish its primacy within the American comic book. The character is also referred to by such epithets as the Big Blue Boy Scout, the Man of Steel, the Man of Tomorrow, and the Last Son of Krypton.

source: Daredevil/Bullseye: The Target
text: Daredevil/Bullseye: The Target Daredevil/Bullseye: The Target is an unfinished limited series comic book from Marvel Comics featuring the superhero Daredevil in pursuit of his nemesis, the assassin Bullseye. The series was written by Kevin Smith with illustrations by Glenn Fabry. It is known for being quite delayed, with the first issue coming out in November 2002, and the second issue never being released.

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Answer: Marvel