The Hellions because The Hellions are Emma Frost aka the White Queen's private army of children and teenage Mutants. However, Ellie Phimister aka Negasonic Teenage Warhead is dressed in the official uniform for the New Mutants aka X-Force which is Nathan Summers aka Cable's (The biologic son of Jean Grey aka Phoenix and Scott Summer aka Cyclops) private army of children and teenage Mutants. However, the comic book version of Ellie Phimister aka Negasonic Teenage Warhead was never affiliated with Nathan Grey aka Cable. So the bottom line is that the movie version of Ellie Phimister aka Negasonic Teenage Warhead isn't a runaway from the Hellions, but rather a runaway from the New Mutants aka X-Force. This is where it really gets confusing because the comic book version of the X-Men used to dress like this before switching uniform designs (Comic book version of Kitty Pryde aka Shadowcat still dresses like this).
Brianna Hildebrand when she isn't filming the movie Deadpool for the Marvel Comics film studio which will be released by 20th Century Fox instead of Disney.
Oh no, Ryan Reynolds as Wade Wilson aka Deadpool just got run over by a car. It's Ryan Reynold's fault. He should've gotten off the road because the car driver almost killed him.