Negasonic Teenage Warhead is a fictional character from the Marvel Comics universe, first appearing in 1997. She is a mutant with the ability to generate and manipulate explosive energy. Her unique powers make her a formidable ally in battles, particularly in the Deadpool series, where she plays a significant role. In the Deadpool films, Negasonic is portrayed as a teenage girl with a punk aesthetic, showcasing her rebellious nature. She is known for her sarcastic demeanor and strong personality, often serving as a foil to the more comedic and chaotic Deadpool. Her character has gained popularity for representing younger mutants in the franchise.