Comic themed t-shirt's produced for women have never been my cup of tea. They nearly always pander to the idea that girls want to date superheros rather than be superheros. Gender neutral design works for me and they can be applied across a range of apparel styles to fit all shapes/sizes/gender.
Warlock ('Locke) New mutants and X-men. Decided to go with characters not well know in the public eye but are known amongst avid comic readers.