Here's a slightly different take on the Jade Court:
An Jung-guen
High Concept: Assassin of the Jade Court
Other Aspects: Always Feeding, Always Hungry; Ghost of Smoke and Fire; Shenwu* have the Sweetest Flavor; I Appear Weakest at my Strongest; All Warfare is Based on Deception
Skills
> Superb: Deceit
> Great: Fists, Discipline
> Good: Conviction, Contacts
> Fair: Rapport, Resources
> Average: Alertness, Presence, Scholarship
Stunts
> Lush Lifestyle (Possession makes money easy.)
Powers
> Soul Eater
> Spirit Form
> Domination
>> Possession
> Claws
> Feeding Dependency affecting:
>> Illusion
>> Human Guise
>> Inhuman Speed
>> Inhuman Strength
>> The Catch: Segaki trappings affecting:
>>> Superhuman Recovery
*Spell casters / Magicians
Also called gaki, preta, jikininki, or simply hungry ghosts, Jade Court vampires prey on humans to remain physical. In their natural state, gaki are ghosts, spirits of hunger. To live, they dominate and possess humans, slowly eating the dominated souls. As time passes, the possessed bodies become thinner, only-bone-and-skin, emaciated human beings with bulging stomachs and inhumanly small mouths and throats.
I wrote that one intending to scare White Council wizards.
Hard enough to kill a regenerating spirit, even harder when it thinks you're a tasty snack and habitually possesses otherwise innocent humans.
In the long run you'll want to create or choose a version which fits your concept. There are far more answers than one or two.