I wanted to start off with a Human Mage with the Rift Mage specilization and a grudge against the Templars (and the Chantry that backed them) with a preference for a green/purple color scheme for the inquisition and a desire to make it a more intelligence based orginzation. For him I was hoping to pursue a romance with our resident diplomat Josephine because Cassandra is pretty much halfway templar herself and seems too in love with her ideals. Appearence wise I wanted to give him a short beard with brown hair, tan skin and green eyes. While much of Thedas will blame magic for the new demonic onslaught my mage inquisitor will strive to prove once and for all that Thedas needs mages - and that mages are here to stay!
I then want to make a Qunari Warrior with the Reaver specialization and a love of big hammers. He will have no horns, just like Sten, and also have a more pragmatic view than that of my mage because, as a mercenary, he is not used to taking sides for political reasons. To him the Inquisition should be about strength and will work to make it a military organization capable of turning the tide of battle against all who oppose it. A red and white color scheme will be his preference, red for the blood to be spilled and white for the purity of purpose. Perhaps he and Cassandra will consider a relationship with one another should their respect for each other as warriors override their racial differences. The world is threatened, and even a mercanary must take a stand at some point - but will the strength and determination of my qunari inquisitior be enough to turn the tide?
Beyond that I do not know if there will be enough "ambigous" choices that have no true right or wrong answers that will ensure differentiation between my inquisitors. The past two paragraphs will ring hollow if both of my inquisitors make the exact same choices. It will also be detrimental if there is only one "correct" way to structure your Inquisition when it comes to the Strongeholds (For example: Just go Commerce based for gold!).