-Hawke is one race with three personalities branches and it was not a nebulous character it was in fact more of a Bioware character rather than the player character still Bioware had thecnical difficulties to bring them back.
I see you ignored me saying "what prevents them from making improvements and taking it a step further and let US define the nebulous character, by basing it partially on choices made in Inquisition and partially on choices given in DA4?"
Because they didn't do it "right" the first time? Well now they know people would prefer to see more than just three default personality flavors. Solution? Give them ways to make choices through the story and variety of responses they can pick or is determined by their choices in previous title.
Possibly complicated during game development, but realistically not more complicated than dealing with any other variables in the game, which includes recurring NPCs different attitudes towards past protagonists or quest results.
-The Inquisitor has the same issues of the Wareden is very nebulous and cannot be defined as an Npc.
If the warden dies it does not matter it is a non-issue since Bioware provide another character to replace them and yet the Orlesian warden commander (which is unkillable) is not reused in DAI for the same issues the Hof and The Inquisitor have.
I've already addressed your "nebulous" point and I don't see a reason why I should now, since you only repeat what you said without hardly any supporting argument for your claim.
And really? How can you say that what the devs have explicitly stated in panels and interviews is one of the biggest issues of ever bringing a possibly dead character a "non-issue"?
You really can't see the difference of having to bring an entirely different character and adressing all the hurdles that come with it (creating entirely new content and VOs on top of everything else) and re-using the same character that doesn't have so many quantum states and DOESN'T require bringing a replacement?
The whole 'replacement' thing is the reason why BW has pretty much said that they won't ever be doing expansions like Awakening and that the entire thing was badly designed from the start. And the reason why Warden-Commander isn't brought to Inquisition is PRECISELY because not just their story - but their entire existence - is entirely dependent on story variables, of which there are simply too many.
-Ciri is not a valid example because Ciri is not only present as a protagonist in a small part of the game but is also an Npc which is sometime with the protagonist and since she has a personality she is perfectly defined.
Ciri is a perfectly valid example - same as GTAV - because it means that people are not confused or respond well to characters they can control, even if to an to an extent. That doesn't mean that BioWare will just copy what TW3 did, because realistically we know that they can't. And that doesn't mean that they can't expand on it, especially that they've explicitly expressed their interest with such stories.
Mike Laidlaw for Kotaku Asks from March'15 : "As to multiple protagonists? Absolutely fascinating and, yes, we have discussed it some. There are a lot of challenges in terms of helping the player identify with more than one created character, but it's a long way from impossible. I thought, for example, that the weaving stories of the GTA V protagonists created a really interesting flow in the story and the gameplay. I agree that betraying yourself would be super cool, so long as "the player" version of you didn't end up feeling like a chump."