...do vampires count at all? Spike certainly is in love, but his heart is dead and probably not delicious. He can try and capture her, though.

I have no idea what blood type Anya has, but I can claim she has AB neg if you need people to hunt!

Though I'm not sure how in love or good her heart is at this point. She has slaughtered countless innocents in her wishes, and though she has feelings towards Xander, I'm not sure they could be called love yet.