From The Hollywood Reporter:
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The X-Men universe has plenty of obscure mutants filling its far-flung spaces but few have had such a unique moniker as Negasonic Teenage Warhead, a telepath with precognitive abilities. It shouldn’t be a surprise that Grant Morrison created her and then subsequently killed her off.
But Negasonic lives on in the movies, with newcomer Brianna Hildebrand now poised to inhabit the character in Deadpool, Fox’s Marvel adventure movie starring Ryan Reynolds.