Pallas

The dress moved like it would slide down her body at the least movement, but somehow it stayed in place. Fashion-plate magic. Her dark hair was in a looping braid to one side of her face. She looked good for someone I'd seen ripped to rotting bits of flesh.

(Bloody Bones, page 325, paragraph 1)

* She is several centruies old.

* When Jason was forced to have sex with her and Bettina, she was the one who came in front behind where Jason could not see her rotting, but the others could.

* She has the ability to fly, basically to shoot up into the air like a lightning bolt.

* She and Bettina killed Raymond Sterling by drinking his blood to death. They were both killed along with Janos when Bloody Bones, the bar and grill, was burned to the ground by the police authorities.