Answer: I don't. If I did...
They should be at least somewhat attractive; Count Dracula was a suave, sophisticated older gentleman from a foreign land, and that's what made him so deadly to women as a blood-sucking creature of the night.
They should be dangerous, but not super-fast parkour masters that are faster than bullets, because they're damn near invincible already.
They should be repelled by symbols of strong faith, strong sunlight and can only enter a person's safe haven by being invited in (with their hypnosis powers, that isn't a good defense).
Basically a combo of old-school late 1800s vampires and Vampire: The Masquerade. Like, on camera they'd be blurry and the cameras would burn out if they stick around too long, and other modern spins on their old traits.