All this talk made me realize something; it's interesting that the vampires only came to attack the hunters after Izumi was back and had brought with him "strong people". It's hard to think it could be a coincidence. And anyway, if they have been a target before, Gantz must know pretty much all about them. (although I used the "if", I think it's pretty clear they were, given the seminar)
Now, on the vampires being aliens or not, that's another question, that can expand to other beings. Except for Tae and the Nurarihyon, all other targets were "seijin". Althought it could be said all of them have what it takes to be commonly classified as aliens, the Tanaka is the best choice to defend they are indeed unearthly; the adult and young Tanaka Aliens, by themselves can't really survive in the Earth's atmosfere, hence needing special equipment. Of course, the young ones seemed just fine, but even so, that other ended up dying because he couldn't make it back to his "shell". And on the youkai issue, the "give back the land" speech also weights to the idea of some of them being earthlings.
The vampires could be native from Earth, and be kept in secrecy because they prey on humans. And it'd be explainable they have advanced technology unreached by current human developments, because if everybody knew about those, it would be a disadvantage. It's easier however assume they are aliens, because they are acquainted to other aliens; and it doesn't seem this is limited to the Oni aliens, after all there was the mention of a "common language", which the Tengu knew. So, it's also assumable there is an "Alien society", and even hostile and non-humanly-disguised aliens are part of it. (Although the Tengu shouldn't be an alien either, if Nurarihyon isn't one)
But, even if the vampires are seijin too, they retain part of their humanity. It seems a sort of symbyosis; Akira retained part of his humanity, and so did the vampire girl, apparently.
And, not that I have any problems with this discussion, but maybe a Vampire thread would be nice? That is, if there isn't one lost around the earlier posts...
Oh. I guess I'll search for it.
EDIT: Well, I've found some, now to check on what's discussed there...
EDIT2: OK, so, the vampires' threads (around 10) are pratically buried pretty deep in the past, being this one the one I found most relevant to proceed with our speculation (although a few of the others had one or another interesting thing to point out currently):
Vampires.. Who are they!?
off-topic: WOW. Back in the days, there were girls around here @@
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