Physical Traits:
  Mildly photosensitive (sunglasses solve the problem nicely).
  Slightly sharpened canines.
  Pale skin.
  Dark hair.
  
Powers:
  Three to four times stronger than a normal human.
  Drinking blood increases strength and enables rapid healing,
    as well as fueling their effective immortality. Don't need
    to imbibe as often as a true vampire.
  Can sense vampires as far away as ten miles, depending on the
    age of the vampire. The sensation gets stronger the closer
    they come to the vampire.
  Can see with near crystal clarity in the dark, but doing so
    makes their eyes glow red.

Immunities:
  Immune to most of the standard vampire weaknesses.
  Immune to the charming abilities of some breeds of true vampire.
  Immune to most normal weapons. It still hurts like hell, and can
    incapacitate, but they heal so quickly that most weapons (shy
    of high explosives, of course) can't actually kill them.

Vulnerabilities:
  Extended exposure to direct sunlight (more than a few hours) will
    sap their strength. Prolonged exposure will send them into
    something similar to sunstroke.
  Staking will immobilize them, and may kill them.
  Beheading and burning will destroy them.
  Extreme injury may trigger bloodlust, like vampires.