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Edit: posting on the wrong account. I'm Toccata, the poster above.
Wait....you'll be wearing a stillsuit? So, this is a campaign set in the deep desert. How are you going to overcome the light sensitivity all duergar suffer from? Forgive the impertenence but it is becoming increasingly difficult to see this thread as anything more than justification for min-maxing and I don't really believe that is your intention.
Anyway, as to your original question-how to roleplay such a character-
I think pathfinder can point us in the right direction. Duergar are described as evil, foul-tempered slavers who put non-dwarven captives to death.
Inquisitors will very likely be exemplars of their faith similar to a paladin. Perhaps even moreso in the case of conversion inquisitors. Use your gods description as a platform for your personality. I don''t know anything about the duergar pantheon, but I imagine it's filled with evil, aggressive, dominanting and merciless figures.
Lastly, your inquisition specific granted power describes your argumentation as coming directly from your divine source. So, your charisma and personality are totally irrelevant because your god essentialy speaks directly through you when using the three associated skills. The specifial effect can be whatever you like, such as a divine flash of insight or divine possesion, etc.
This brings up an interesting point. Your character could in fact be a high function autistic person, which would be my preference in playing such a character. You could be essentially an empty vessel for your gods divine will. You exist to serve in this capacity and a perfect servant in this.
You'll be able to use your divine social skills when needed, but at other times you simply are incapable verbal interaction. This would solve a few problems for your gm while opening a ton of rp and story opportunities.
Of course autistic people can and do interact, but these interactions are often unpredictable.
I must say that I find this concept to offer a unique challenge and might be a really fascinating way to stretch your rp skills
I hope this helps :)
Second edit: I don't mean to suggest that autistic people are empty vessels. This is merely a way to help an rp scenario.