Question: Who created the character Brianna Hildebrand plays in "Deadpool"?

Context articles: Deadpool 2
List of accolades received by Deadpool (film)
List of box office records set by Deadpool (film)
Brianna Hildebrand
Negasonic Teenage Warhead
Slayback
Deadpool
First Girl I Loved
Deadpool (film)
Tragedy Girls

Deadpool 2 is an upcoming American superhero film based on the Marvel Comics character Deadpool, distributed by 20th Century Fox.
 It is intended to be the twelfth installment in the "X-Men" film series, and a sequel to the 2016 film "Deadpool".
 The film is being directed by David Leitch from a script by Rhett Reese and Paul Wernick, with Ryan Reynolds starring in the title role alongside Morena Baccarin, T. J. Miller, Leslie Uggams, Brianna Hildebrand, Stefan Kapičić, Zazie Beetz, Josh Brolin, and Jack Kesy.
"Deadpool" is a 2016 American superhero film based on the Marvel Comics character of the same name, distributed by 20th Century Fox.
 It is the eighth installment of the "X-Men" film series.
 The film was directed by Tim Miller from a screenplay by Rhett Reese and Paul Wernick, and stars Ryan Reynolds in the title role alongside Morena Baccarin, Ed Skrein, T. J. Miller, Gina Carano, Leslie Uggams, Brianna Hildebrand, and Stefan Kapičić.
 In "Deadpool", Wade Wilson hunts the man who gave him mutant abilities, but also a scarred physical appearance, as the wisecracking, fourth wall-breaking antihero Deadpool.
"Deadpool" is a 2016 American superhero film based on the Marvel Comics character of the same name, distributed by 20th Century Fox.
 It is the eighth installment of the "X-Men" film series.
 The film was directed by Tim Miller from a screenplay by Rhett Reese and Paul Wernick, and stars Ryan Reynolds in the title role alongside Morena Baccarin, Ed Skrein, T. J. Miller, Gina Carano, Leslie Uggams, Brianna Hildebrand, and Stefan Kapičić.
 In "Deadpool", Wade Wilson hunts the man who gave him mutant abilities, but also a scarred physical appearance, as the wisecracking, fourth wall-breaking antihero Deadpool.
Brianna Caitlin Hildebrand (born August 14, 1996) is an American actress.
 She is known for appearing in the web series "Annie Undocumented", and as Negasonic Teenage Warhead in the 2016 film "Deadpool".
Negasonic Teenage Warhead (real name Ellie Phimister) is a fictional character appearing in American comic books published by Marvel Comics.
 The character was created by Grant Morrison and Frank Quitely, and named after the song "Negasonic Teenage Warhead" by Monster Magnet.
 The character is a mutant who displays telepathic and precognitive powers, and is a student of Emma Frost.
Slayback is a fictional character appearing in American comic books published by Marvel Comics.
 Primarily an enemy of Deadpool, the character exists within Marvel's main shared universe, known as the Marvel Universe.
 Created by writer Fabian Nicieza and artist Joe Madureira, the character first appeared in "Deadpool: The Circle Chase" #1 (August 1993).
Deadpool (Wade Winston Wilson) is a fictional antihero appearing in American comic books published by Marvel Comics.
 Created by artist/writer Rob Liefeld and writer Fabian Nicieza, the character first appeared in "The New Mutants" #98 (cover-dated February 1991).
 Initially Deadpool was depicted as a supervillain when he made his first appearance in "The New Mutants" and later in issues of "X-Force", but later evolved into his more recognizable antiheroic persona.
 Deadpool, whose real name is Wade Wilson, is a disfigured and mentally unstable mercenary with the superhuman ability of an accelerated healing factor and physical prowess.
 The character is known as the "Merc with a Mouth" because of his talkative nature and tendency to break the fourth wall, which is used by writers for humorous effect and running gags.
First Girl I Loved is a 2016 American romantic drama film written and directed by Kerem Sanga.
 It stars Dylan Gelula, Brianna Hildebrand, Tim Heidecker and Pamela Adlon.
 The film premiered at the 2016 Sundance Film Festival and won the Audience Award for "Best of NEXT".
The film follows two teenage girls, nerdy yearbook editor Anne and softball star Sasha, wrestling with their sexuality at a Los Angeles high school.
 It was released in the United States and Canada in select theaters and on demand October 18, 2016.
Deadpool is a 2016 American superhero film based on the Marvel Comics character of the same name, distributed by 20th Century Fox.
 It is the eighth installment of the "X-Men" film series.
 The film was directed by Tim Miller from a screenplay by Rhett Reese and Paul Wernick, and stars Ryan Reynolds in the title role alongside Morena Baccarin, Ed Skrein, T. J. Miller, Gina Carano, Leslie Uggams, Brianna Hildebrand, and Stefan Kapičić.
 In "Deadpool", Wade Wilson hunts the man who gave him mutant abilities, but also a scarred physical appearance, as the antihero Deadpool.
Tragedy Girls is a 2017 American comedy horror film directed by Tyler MacIntyre and written by Chris Lee Hill and Tyler MacIntyre.
 The film stars Alexandra Shipp, Brianna Hildebrand, Josh Hutcherson, Craig Robinson, Kevin Durand and Jack Quaid.
 The film is scheduled to be released on October 20, 2017, by Gunpowder & Sky.