Werepires will certainly be interesting. They'll need to be designed carefully to prevent being overpowered, but they'll be interesting. May I suggest that they take the sun-immunity of werewolves, the powers of vampires, and the ability to transform into werewolves (among other combinations)?
And there'll be plenty other combos, too, if I have anything to say about it. Boquabian Elves, the Boquabian equivalent of Cambions (if Dryad allows with her Incubi and Succubi), Half-Nymphs (when I get around to making Nymphs and Satyrs) and more.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)