Carmilla

According to the main site, this vampire is going to appear in Chapter 3 of the game.

The main site mentions that she is the right hand and maid of Queen Vampire.

She was in charge of infiltrating with arround other 30 high-rank vampires in Sabasa Castle during Chapter 3 epilougue (demo version), and stays locked in the throneroom after the king discovers her and seals the room together with the whole castle.

She seems to like strong men, but obviously she can't stand baptized people blood/semen, and looks like a bit ignorant about human behabiour (not knowing royal members are all baptized, something Elizabeth allready knew).