Domino – also known as Neena Thurman – is part of X-Force, an X-Men offshoot, and was created by Fabian Nicieza and Rob Liefeld. She’s a crackshot and superb hand-to-hand expert. Her powers let her alter probability and that’s rather handy for a marksman.
This Domino cosplay is by Sweet-Little-World and photographer Victor Hugo.
Via Nicola Wakelin at Fashionably Geek who describes the cosplay as “Deadly and Sexy”.