Vampire Prostitute

This unnamed female model (モデルの女,) appears in the beginning of the first episode of the Hellsing anime created by Gonzo.

At first, she appears to be a prostitute, with her client's dialogue implying that he's a vampire; it later turns out that she is actually the vampire or a Draculina. In the anime specifically, she's the first ever vampire to get killed on-screen, and also Alucard's first, on-screen kill.

Appearance
She dressed in black, and had a dark, long hair which even covers her eyes; which was revealed to be yellow in color. A woman built normal, she was an attractive woman with a very pale skin. Also, after entering a mansion, she wore a beige coat. She also wore ear piercings on both ear, which were colored in yellow.

She wore the eye emblem, also seen on Jan Valentine's hat, on her necklace, implying that she may be a member of The Master of Incognito.

Involvement
A man from a noble family drove her to his mansion, and after reaching to his mansion, the man; named "Peter Winfield", began to compliment her and touch her inappropriately, before a man dressed in red interrupts the two.

Soon enough after the man introduced himself as a member of the Royal Order of Protestant Knights, he pulled out a gigantic pistol and aimed at Winfield, before turning around and aimed at her instead. He pulled the trigger, which hit her directly on the head, to her brain; and revealed that she's actually a vampire to Winfield after dusting away.

Trivia

 * A character with an identical model, though in a red dress rather than a black one, is staggering seen around at the beginning of the second episode, and attacks Kim. She is killed by a Hellsing sniper after Seras can't get the will to shoot.