Voluntary Shapeshifting: The Firstborns have the ability to disguise themselves as random civilians to blend in on the streets.However, it seems that humans will only transform if a vampire quickly bites them or only partially drains their blood (like what Mary did to Cole, or what the Firstborns do with the civilians they attack) if a person is completely drained dry, they simply drop dead (whenever Cole or most vampires feed on people, they never turn). Viral Transformation: Obviously, the vampires increase their numbers by turning humans into more of them.Cole himself can fly around the city as long as his blood meter is filled up. Villain Teleportation: All of the vampires (except for the infected citizens who got bitten by Firstborns) can quickly move around by changing into a shadowy flock of bats and flying/teleporting from place to place.
And even then, Cole is unable to resist his thirst for blood, so he's forced to prey on innocent people until he can remove his curse. Cole is able to (mostly) resist Mary's control over him, and actively fights back against her forces however if he doesn't kill her before sunrise, he will become her slave permanently.
Transhuman Treachery: Vampires are Always Chaotic Evil, and almost every person whom Mary turns into one become her mind controlled slaves with no free will of their own.However, it doesn't explain their more supernatural qualities, like their aversion to holy objects.
However, Cole and Zeke speculate that vampires may actually be a sub-type of conduits who have blood-based abilities.