Oh right, my favorite NPC is the spirit of command ("or pomposity") you meet in Crestwood. Second place is Briala. (I don't remember enough Origins/2 NPCs so yes.)
And here's a thought I had recently re: Solas. So let's pretend that his involvement in the Breach's creation ever comes to be known at the Inquisition. Not even his true identity, per se, though they're connected, but the "I gave Corypheus the orb" thing. And let's also pretend Leliana was "hardened" and is Divine now, and discovers the actions of this elf she is currently kicking herself for underestimating (per his updated codex entry) led to the murder of her beloved Justinia...
I mean, there's your Exalted March DLC right there, Bioware. It'll never happen, but I super like the idea. I suppose I'll have to explore it in...ugh, fanfiction. (On a related note, I'm bitter because I spent my whole canon playthrough pushing for Leliana as Divine, unhardening her and such, but ended up with Cassandra. Who I'm happy for! But now instead of a loving, accepting Divine, I have a compassionate spymaster on my hands. *Disgusted noise.*)