According to reports, "Deadpool" director Tim Miller is developing an "X-Men" spin-off feature, based around the Marvel Comics' character 'Kitty Pryde' aka 'Shadowcat':
The character debuted in Marvel's "Uncanny X-Men" #129 (January 1980) created by John Byrne and Chris Claremont.
A 'mutant', Kitty Pryde possesses a 'phasing' ability that allows her, as well as objects or people she is in contact with, to become intangible. This power also disrupts any electrical field she passes through and lets her simulate levitation.
During the Marvel mini-series "Kitty Pryde and Wolverine" she is renamed 'Shadowcat' and after joining 'Guardians of the Galaxy', assumes her fiancé's superhero identity as 'Star-Lord'.
In the Fox "X-Men" film series, Kitty was portrayed by Sumela Kay in "X-Men" (2000), Katie Stuart in "X2" (2003), Ellen Page in "X-Men: The Last Stand" (2006) and "X-Men: Days of Future Past" (2014).
Click the images to enlarge and Sneak Peek 'Kitty Pryde'...