That's mine, hands down.
Functionally impossible to harm by any means (even the passage of time), in service to a horrible otherworldly monster, fears nothing save being confined (which makes sense), and he's not just undead... he's *DOUBLE* undead.
Meaning he was dead, he was raised as a vampire- then burned alive and turned into a parasitic ghost... thing that can eat your fucking soul.
And what's more he never falls into the trap of acting like a malicious monster for its own sake.
Plus he lives in a world where vampires look like this:
And in a post Anne Rice world that fact makes me happy.