Spawnling: Shin's frenzies would be about what you'd imagine; he essentially loses his higher reasoning and enters a beastial state of "fight or flight," wherein he can only comprehend feeding and his own survival.

I would rather have stronger regeneration than overall durability. Purely to stay truer to my inspirational sources. We could make him no more resilient than a normal person, but with extreme regenerative ability.

The charisma would be partly a strange, inhuman beauty, but I was also thinking of granting him the power to dominate the minds of the weak-willed. Typical "vampire servant" stuff.