Astarion (spoiler)
. At the same time, there is a plot explanation (well, almost) why he is not afraid of ultraviolet.
At the same time, there is no difference in his reaction to necrotic damage, to poisons, to treatment, to the "expulsion of the undead"...
I understand that this is not Divinity. The undead didn't get much attention here. Playable undead should not be provided here, because the problem with the larva will not be a problem for the undead.
If you do not take into account the plot, then the game in such a world should contain playable undead. That would be interesting. But with a vampire, there is no final clarity.
Many spells in the game are supposed to be "racial traits" of a vampire. Potion treatment should not be possible for Astarion. Etc.