Countess Mircalla Karnstein, also known as Carmilla and Millarca, is the titular main antagonist of the 1872 Gothic horror novella Carmilla. Set in Styria, it tells the story of a young woman, Laura, who befriends with lovely Carmilla, only to find out that she is actually the vampire, Countess Mircalla Karnstein.

Carmilla has unearthly beauty and languid movements.  She can take the appearance of a black cat.

Carmilla chooses young girls as her victims.

