This is a Guild Wars 2 Cosplay from Miss Fortune out League of Legends.
A Bilgewater captain famed for her looks but feared for her ruthlessness, Sarah Fortune paints a stark figure among the hardened criminals of the port city. As a child, she witnessed the reaver king Gangplank murder her family—an act she brutally avenged years later, blowing up his flagship while he was still aboard. Those who underestimate her will face a beguiling and unpredictable opponent… and, likely, a bullet or two in their guts.
League of Legends (short: LoL or simply League) is a computer game developed by Riot Games for Windows and macOS. The game was released on October 27, 2009. It is a free-to-play MOBA supported by micropayments. The game was played in 2016 by about 100 million players per month.