I've considered the same. However, I've encountered a few without any noticeable abilities. It could be their strengths lie elsewhere.

[The calmness and logicality that D exudes has begun to cool some of his own crackling irritation, so that now his urgency about the Horseman is overtaken with interest about the dhampir in front of him.]

Your senses are magnified. You weren't very close to him, but you could tell that much? It would imply he wasn't a living creature of any kind. [I mean, he was also missing a head...] But he was still corporeal enough to hurt others.

As only half vampire, are you required to drink human blood to survive?