White Court Vampires? Their mind powers, and even physical damage from them (Punching - not being smacked with a big sword, or shot by one?) Just them? What would the cost be?
I've got an idea for a Knight of Erzulie (Voodoo Loa of love/lust), who operates out of New Orleans. I can't see Erzulie liking the white court in any shape, way, size or fashion.
The Knight would be a famous Transvestite performer. When required, he would take on the aspect of Erzulie (i.e, be mounted by her). In Petro war form, two large poison snake whips would sprout from the back of his arms, and would inflict mental damage, and sticky tag the bitten with delirium. He would be an npc, but I think would be a ton of fun. A knight of a specified loa would be someone who is regularly mounted by said loa (marked by the power of the loa). As a general rule, the knight wouldn't serve as a mount for other loa, but this would certainly be possible in unusual situations (pay a fate point or the like).
But, do you think the immunity would be reasonable?