Before Deadpool, most of us had never heard of Negasonic Teenage Warhead and who can blame us? She only actually appeared in the comics three times, two of which she died and a third where she wasn't even real. Because of her obscurity, it wasn't such a big deal for Negasonic to be completely reinvented for Deadpool, not only in her abilities but also her look. Check her out in the hilarious Red Band trailer for the movie:
Looking at some of the initial concept art by artist Joshua James Shaw, it's clear that the original character bore far more of a resemblance to her fleeting comic book counterpart.
Josh wrote on his blog:
"It turns out I was going overboard with the goth look for NTW and Tim wanted us to do a pass of her in a suit close to what Josh Middleton designed for his New Mutant covers. Then the costume department would put together something over the suit to give her the goth look. I've learned over the years that some directors care about the source material, and you can guess which ones don't. Fun Fact: Tim goes to the comic store just about every week and leaves with a PILE of comics!"
In the end, of course, the Deadpool decision makers went for the distinctive shaved head and classic New Mutant-like costume we saw on Brianna Hildebrand in the movie.
As you can see, the concept art is massively different from the final version - although somewhat sexier, it probably just wouldn't have worked as well in the final film. Despite having a hardcore Monster Magnet-inspired name, the comic version of Negasonic Teenage Warhead's main power was seeing visions of the future, whereas in the film she was given her a more powerful ability and an attitude to match. See her in action in the clip below:
You can also see costume concepts for Deadpool himself, as well as other art for X-Men, Halo and more by checking out Joshua's portfolio.