This is more of a musing than a suggestion, so I'm putting it in the story forum rather than the suggestions forum (it is WAY too late to make these kinds of suggestions, anyway).
So, it occurred to me that it'd be quite interesting if--despite appearances--the Iron Bull would very nearly always rather resolve a situation by talking than fighting. This would be a very "law enforcement" attitude to have and really drive home the fact that he wasn't really a soldier, he was a policeman (of sorts), focused toward defusing situations, protecting people, apprehending "criminals" (preferably alive). His "MAYHEMMMMM" personality is a front, designed to convince people that messing with him is only going to end in disaster--for them. He's friendly, he's personable, he'll listen to your sob story and you talking about your beloved pet that got run over by a cart for hours on end if that's what it takes to get you to take your hand off the detonator. If necessary, he'll bring the beer and drink you and everybody you know under the table.
I'd find that to be a really fun and often surprising sort of character, with lots of room for interesting discussions and conflicts. Maybe the "convert or die" ultraviolence of the antaam doesn't sit well with him. Maybe he got "retired" in a way because he'd reached a stage where he'd really just rather let people alone as long as they weren't actively hurting anyone, even if they were totally ignoring the "demands of the Qun" and otherwise being a pain in somebody's butt. Maybe he's close to becoming an outright "people are nucking futz" cynic and saying "I don't care any more, let them butcher each other if that's what they want, ideals are useless" and the Inquisitor can push him over into outright nihilism. Oh, alternatively, help him rediscover whatever idealism he had remaining--remembering that he's a Qunari and just what ideals, exactly, he supports.
Of course, I'd want there to be a Third Way where you can maybe help him find his own idealism, but that'd be an interesting basic alternative: do you push him over the edge so he gives up on the Qun, or do you try to help him, knowing that he might turn against you and return to the Qun if you do? That's a REAL threat--if the Inquisition succeeds suddenly they're the most powerful single organization in all of Thedas. Which makes them a BIG threat to the Qunari and whatever invasion plans they're cooking up. And why would they send assassins to destabilize your organization when they've already got a man "on the inside", as it were?
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It would be nice to see he has a tactful side. 
. Sometimes body language, and tone of speech are far more intimidating than physical stature. Why bite when a bark can be so much more effective.
