I love good characterization. It's so hard to find.
So I've been going through the BtVS crossovers section over at the Pit of Voles, and I came across a crossover with HP called Sirenes. The story itself is a bit... meh, but Drusilla. Oh, Drusilla's characterization in this fic is amazing. I can hear her lines--they're just what she would say.