The Dark Urge is customizable.
Orin is a shapechanger.
--the clear question is whether or not the Dark Urge is also some sort of shapechanger, stuck in form after the insertion of the tadpole due to some whatever netherese deflector shield thing-a-ma-bob.
Then I kind of start to wonder. The game allows respec.
--is it possible the respec feature isn't just a mechanic? Perhaps it's built into the narrative in some manner, and of particular importance to the Dark Urge?
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All of that said, there's nothing wrong with the idea--in my opinion--that the Dark Urge is a sorcerer in canon... but would happen to work better as a rogue. Both of those things can be true.
And it's equally true that we're working with incomplete information.
I am inclined to think that no, the Dark Urge isn't a shapechanger because the dark urge actually has the benefits and traits of his starter race and subrace, a shapechanger would not. But we may gain the ability to shapechange as part of the rewards of following the dark urge as we are receiving boons from Bhaal...who himself was a shapechanger rogue assassin and that is what Orin is as well.
