I don't like to constantly hear how Hawke is a single big mistake. That's not funny! I spent multiple playthroughs with her, Kirkwall felt like home, I genuinely like her and bonded so much more strongly with her than any of the rather characterless characters. Hawke was awsome. 
My first canon Hawke is a total C-word. For reals. His very existence is a mistake.
Aggressive, blood mage, Rivalemanced both Anders and Fenris to watch them bicker with each other. Ditched Anders, stayed with Fenris (in what is a pretty messed up relationship), cracked a joke when his mother died, cracked a joke when Seamus died, willingly helped Anders put his bomb together and distracted the Revered Mother for him, was constantly foul to Merril, slept with Isabela, let Talis run off with her list of names, couldn't tell that Larius was SO OBVIOUSLY possessed (knowing him, he probably didn't give a toss), let Varric keep the idol, let Isabela keep the tome and then killed the Arishok, let Anders live and sided with the crazy mages...
He was a total screw up and an absolute dick. But that's why I like him and made him one of my two canon Hawkes. He would have been amazing as the Inquisitor. Orlais would have burned to the ground
Best option for Thedas.
Cass would have deeply regretted putting so much effort into hunting him down for the job.