The other thing to watch out for is that greasy is also used a fair bit for the Red Court's bat-like form, alongside slimy (and flabby, but I suspect that's less relevant).

complet stab in the dark here. but vamps are demos from som where ells reaching in to someones soul and infecting it right...at least that what the white court vamps looked like when harry soul gazed tomas. so could it be posible that at least with the red that the dmon infecting the mortal could be an outsider??? cluching at staws here i know but its a posibility.

also i remeber the descrpition of the outsider gouls that cowl sent in to the raith deeps was it somthing along the lines of discsting and gotesc kind of like the decripton for red vamp....havn't got the books to had so I can't say for sure..