Detroit in the Dresdenverse
The Dresden Novels as of the time of this writing (Ghost Story) only mention the Jade Court in passing. Thus all of this is made up for our game. However, if it gives you ideas for yours, feel free to use it.
The book (Shiro in Death Masks) talks about Southeast Asia as the place of origin for the Jade Court… there’s really only a handful of legends from that part of the world that are scary enough to justify “vampires” … so I am heavily basing them research on Thai Folklore. As a bonus, this particular monster also appears in Japanese myth.
The Krasue have two use-forms. Their normal, stunningly beautiful, appearance; and their ghost-like one.