"I've never had a cross glow when you were the only vampire around."

The Vukotic siblings are the only vampires who cannot be killed by any means.

Some days it occurred to him to wonder if he was the world's only anorexic vampire.

Or had he not been the only vampire in that spotless apartment?

"They are the only vampires in our history to purposefully hunt down their line and murder them."

The only vampire he'd brought with him moved around the couch to stand beside him.

Zeca is the only vampire who chooses to protect the humans.

He is perhaps the only vampire who doesn't exhibit the evil behavior of other vampires in the series.

He is also the only vampire to have two cantrantias or core powers.

It also follows the only vampire he is known to have created, Pearl Jones.