A character that was labeled as a black clad Hatsune Miku, Black Rock Shooter became her own entity on September 20, 2009. Crypton, the company that created Miku, announced that Black Rock Shooter has no relation with the Vocaloid character.
Black Rock Shooter is 15-years-old and is well known for her massive projectile weapons. The Black Canon can shoot up to 20 rocks per second, but she is also seen with a sword known as the Black Blade.
I think that’s a rather unique interpretation of the blue flame erupting from her eye. As the contributor Fernandez said, “this cosplay’s sizzling hot”!