All but Gale and Astorian.
Gale consumes too many artifacts. Though t might be fun to see where his condition leads if you do not feed him.
I have never liked the idea of Vampire characters...especially ones that heal spells/potions do not cause damage. If he dies and then is resurrected his vampirism should be gone as he would now be alive.
Bending the rules to a minor degree is one thing but this is too much.
One alternative for full healing would be knockout a bad guy and them let him feed on the unconscious.
