Bianca St. Claire

Bianca St. Claire is a vampire of the Red Court. She first appears in Storm Front.

Description
Introduced in Storm Front, Bianca is the head of the local Red Court coven. She has considerable influence in the Nevernever and power with a capital "P."

She owns and operates the Velvet Room, a high-priced brothel. Both Jennifer Stanton (at the time of her death)  and Linda Randall (previously) had been Bianca's employees.

She possesses considerable magical power, taught to her by the Black Court vampire, Mavra.

Two of her lieutenants–"associates"–are Kyle and Kelly Hamilton, a brother and sister team.

Storm Front
In Storm Front, Harry goes to ask her questions about Jennifer Stanton, who was murdered, and Bianca immediately attacks Harry thinking he's her killer. During the tussle, part of her human mask tears away revealing a hideous bat-like creature underneath. Harry swears by his powers that he did not kill Jennifer. She gives Harry the name of Jennifer's friend, Linda Randall. Harry sees in her eyes that she will not forgive him for unmasking her. She vows to make Harry pay. — Her assistant Rachel enters as Harry leaves, he witnesses Bianca devour her.

Grave Peril
In Grave Peril, Bianca hatches a plan that would undo Amoracchius, kill Harry Dresden, and instigate a war between the White Council and the Red Court. She uses Susan Rodriguez by infecting her with the vampire toxin, then manipulating Harry into fighting the vampires to get her back, thus starting The War. Near the end, Bianca and the majority of her coven are killed by the spirits of those she killed, led by Rachel's coven.