Also evil Shades from hell. Treelords are necromantic. And we've got hobbit vampires. We don't have anything like werebeasts, though.
Slight correction, both halflings and formics can be vampires [that are quite different from vanilla]. Formic vampires are supposed to be more rare, while hobbit vampires are more common than vanilla.
I haven't adventured in the latest versions, but some versions ago this used to actually be completely not so as concerns vampire rarity by species, and overall a slight annoyance, since formics have a high reproduction coupled with a short lifespan to keep their population from exploding. Vampirism, of course, makes them live forever. So you end up with huge amounts of formic vampires. Underground lairs full of them, workers, soldiers, queens all. Once I had a row of >10 formic vampire lairs extending to the map edge near a city, every one of them packed with formic vampires. I looted two nearby formic fortresses for their arrow supply in an effort to extinguish the vampire ant menace and still ran out of arrows trying to kill them all.
(There's also vampirism-immune paladins, although I don't think anyone used that feature in a report yet. Highly recommended for trying something like this unless you want to catch it too.)