Question: What mutant character is played by American actress Brianna Caitlin Hildebrand in the 2016 film Deadpool?
Context: "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. 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. Tempo is a fictional African-American mutant character appearing in American comic books published by Marvel Comics.  She was first introduced as a member of the Mutant Liberation Front in "New Mutants" (February 1990). "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. David North (born Christoph "Christopher" Nord) is a fictional mutant character appearing in American comic books published by Marvel Comics.  He was originally known as Maverick, and more recently as Agent Zero.  The character first appeared in "X-Men" (vol.  2) #5 and was created by Jim Lee. 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. 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". 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. 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. Brianna Perry (born January 11, 1992), also known as Lil' Brianna, is an American rapper and actress from Miami-Dade County, Florida.  She was the youngest act signed to Missy Elliott's label The Goldmind Inc. as well as the youngest to be affiliated with Slip-N-Slide Records, home to rappers Trina and Rick Ross.  Perry made her debut on Trina's album "Diamond Princess" on the track "Kandi".  Since then, she has released several mixtapes and starred as a regular cast-member on the reality-television series "Sisterhood of Hip Hop". In 2016 Brianna left major label Atlantic records due to low promotion and moved forward with her indie label poe boy entertainment
Answer: Negasonic Teenage Warhead