When millions of moviegoers flooded theaters this past weekend to see "Deadpool," they not only got to know the crass title character played by Ryan Reynolds, they met a few other characters that who are either mostly obscure or known only by hardcore comic-book fans. One of the standouts is Negasonic Teenage Warhead (Brianna Hildebrand), a grumpy millennial teen girl with a tendency to get lost in her smartphone just as a super-brawl is about to break out.

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