There's Jiang Shi, Stella/Loretta, Elizabeth, Carmilla, Brauner, Olrox, Vincent (only for a while), Gilles De Rais, Joachim, Walter, and I'm sure there's a few more mentioned in the mangas.
What do the fans prefer more: killing an army of mythic creatures that vary shape & size, or killing an army of vampires that all have human forms & behave the same (with a few exceptions)?
Perhaps the real question is, why didn't Dracula turn Hector & Isaac into vampires?