"Some of these characteristics above are imaginary, but vampires exist"
I met someone from New Orleans some years ago that said he came from a long line Vampires and that they drink blood regularly .... He said he had relatives 480 years old .....
However we were both drunk and had one hell of a fight after I called bullshit. He did however have a lot of unusual insights into that life style.
If you ever want to know the truth, that is the first place I would start looking.