Negasonic Teenage Warhead

Ellie Phimister, alias Negasonic Teenage Warhead, is a mutant and a member of the X-Men under the tutelage of Colossus.

After spotting Deadpool on the news, Colossus took Negasonic Teenage Warhead with him in an attempt to convince the mercenary into joining the X-Men. However, Deadpool declined and ended up fleeing from the mutants. Later, the mercenary would enlist the two mutants' help in saving Vanessa Carlysle and defeating Ajax. During the ensuing fight, Negasonic Teenage Warhead used her powers to take out multiple soldiers and save Colossus from getting strangled by Angel Dust. At the battle's conclusion, Negasonic Teenage Warhead, after acknowledging a reference from Deadpool, left the area with Colossus as the mercenary reunited with Vanessa.

She is portrayed by Brianna Hildebrand.