...that my ... Inquisitor was one questionable decision away from becoming what most of Thedas would consider a super villain. ... where Solas actually has to stop Lavellan ... where the player is the antagonist and doesn't even realize it.
I might completely misunderstand the issue, but what Taelaa wrote here has nothing to do with being submissive or dependent. What she suggested had not occurred to me before, so I cannot claim to be particularly fond of it. But now that I start to think about it I am interested. What she suggests is:
Give the Inquisitor too little information, throw her into a situation where she is forced to make decisions without actually being suited to do so. Let her believe -- which the player will, because we never know what will happen in the future -- that she is the hero. And then later on show that her decisions did not improve the world, quite to the contrary. I actually like this.
I played a game once that made an attempt. You played a wrecked FBI agent, used to be a hero but cracked due to some bad experiences. Started to drink and turn into an a**hole. Then you are tasked with saving the world, because that's what people do when they still believe in you, right? (There were some holes in the story writing, unfortunately, but let's ignore this for now.) So you set out to save the world from aliens and impress everybody, show that you still got it. But then at some point the player suddenly has to realize that it was all a hoax. He never recovered, he never was the hero. In fact, he is just that stupid a**hole everybody thought he was, and he's completely lost his marbles. (I will spare you the twist here.) So you switch characters and have to save the world in another body, even fighting that wrecked ex-agent. It was executed rather poorly (not too bad though) but I liked the basic idea.
What Taelaa suggested is different from the game I just talked about, but that's not the point now. I think it still goes into that direction I mentioned, it is not about being a puppet or having been unimportant all along. It is about making decisions to the best of your knowledge, only that your knowledge simply wasn't good enough.
Or assume you were actually the villain all along, only the player did not know it because nobody explicitly told us. The player just assumed s/he wanted to do good, but the protagonist never had such intentions.
However, I don't see BW doing that. It would be too difficult in an RPG, I think. Or at least I don't see how it should work. And usually the audience isn't open-minded enough for that because it contradicts the full-control approach. But still, Taelaa did not speak about anything submissive/dependent/devout/etc.