1) Varcen Mahariel. Dragon Age: Origins was the first Dragon Age game, so of course it's going to have some nostalgia. But I truly loved it for its roleplay value. Six different origins, a plethora of dialogue options, and no karma scale meant I could be a knight-in-shining armor one minute and a ruthless, cutthroat blood mage the next. It's one of the few games I'll pick up and play just for the heck of it, years later. It's like Baldur's Gate--I'll never tire of playing it and nothing will really replace it. Well, almost nothing, because in a close second is...
2) The Inquisitor. I really loved the Inquisitor--the wide range of roleplaying options, the emotional dialogue wheel, some truly nice friendship and romance scenes, and sheer badassery has really endeared them to me. And the game itself is liked Assassin's Creed crossed with Skyrim crossed with Dragon Age--it's enormous, gives a lot of lore, and has mind-boggling content. I haven't settled on a canon Inquisitor yet, but they're dangerously close to overthrowing my Warden as my favorite.
3) Danica Hawke (Snarky!Hawke). Snarky!Hawke is a fantastic breathe of air in a horribly angsty game. When everyone around them was screaming "blood magic" or "doom", they were standing there cracking jokes and trying to diffuse the tension--heck, they came across as a more reasonable authority figure than Elthina! Also, their bromance with Varric is the best I've ever seen.
4) Geoffrey de Moreau, Marquis of Serault. The Last Court was not an amazing game, nor was the Marquis a particularly fleshed-out character. But it made the wait for Inquisition less painful, and I was pretty fond of the guy by the end of it. The Marquis isn't trying to kill an archdemon or save the world or anything big, they were just trying to handle mundane problems in their little part of Orlais. It provided an interesting change.
5) Other Hawkes. Diplomatic!Hawke is boring and Aggressive!Hawke is a jerk. Nothing really interesting here.