For me my first and blind playthrough is always my canon, and my character and LI the ones I get the most attached with.
I've made new playthoughs to experience the content I've missed, and while it doesn't feel the same I still enjoy them.
I'm completely the opposite! I create an infinite amount of "sketches" of what is going to be my canon. For example, before having the ability to delete characters in the keep I had 50 (yes 50) versions of Malcolm, the DW rogue with whom I finished my "Hard" playthrough. Now, he was not my canon yet! Edmund (my current Nightmare PT and the one in my avatar) seems to be finally "the one". If that is the case, and I finish everything that is around in DAI at the moment (I'm an obsessive completionist) I will have him sitting waiting for a DLC (hopefully a sequel), I'm not interested in replaying the game after I complete my canon PT to experience other romances, or outcomes in the game, not even a different class. That was what I did with the other 50 sketches.
Also, I'm an avid roleplayer (even in a Single Player setting) and spend a lot of time "outside" the game tinkering on him, imagining what would have been happening while I'm not "seeing" him (playing). It is kind of crazy.
Oddly, the fact that DAI has so much "menial" tasks to do, instead of being a waste of time for me, it is something that I enjoy, precisely because amounts in game to the type of activities that otherwise I would imagine he would be doing when I am not "looking".
That is also working against me since otherwise I would be pouring some of that tinkering in FF, something that has yet to happen in the DA series (I have FF written for every single RPG I've played).