The Twilight Princess destined to become the Twili's next ruler, Midna's reign was cut short when Zant took her throne from her illegitimately and turned her into an imp. Not wanting to allow Twili's denizens to fall into corruption, Midna escapes, stealing a piece of the ancient artifact known as Fused Shadow which she wears as a helmet. She then begins her quest to find the remaining three pieces in hopes to achieve enough power to defeat Zant.
Quite an impressive cosplay! Looks like it was taken near Hyatt Hotel, too. Nice work!