The cosplayer is Alberti of the Russian Imperia cosplay team. The character is an original creation, a Lady Inquisitor, who looks pretty scary.
In response to a comment on her Deviant Art page, Alberti rebuked;
Who said that an inqiuisitor can’t be a fairy godmother? ))))
Photography by Fillakteri Art and Irina “Iskalda” Zlobina.
GeekNative she looks badass