This is Nameless. She actually has a name, but I dare not write it out.
Her father is the Dark One known as Satan.
She is a highly dangerous and lethal entity.
A demon who flies as a bird at night to suck the blood of people.
She can only suck the blood from people who have heard her name.

You never want to awake at night to see her peeking in your door.
Her grinning face will be the last thing you'll see.