If I were one, I think I would be an awful one that doesn't fit the category of a real badass vampire.
I would only drain blood out of the really horrible people (for instance a rapists or child molesters). Apart from that, I'll go for some animals. I don't think I would have it in me to go for someone innocent, even as a vampire.
Most Helpful Guy
I would be the seductive kind, if I had a choice. Though, I did like the vampire lore in Sunshine by Robin McKinley0
Most Helpful Girl
So what happens when the world is clear of all the bad people?