My favorite two have to be female city elf and dwarf noble. While DA:O was advertised as a dark fantasy game, I found the sequel, for all of its flaws, to be much truer to the alleged genre of the series. The DN and CE really capture "dark fantasy" really well.
The dwarven society is very Machiavellian, and reminds me a great deal of the Drow minus the matriarchy and religious zealotry (though there is still an extreme dogma in place, it isn't religious so much as tradition). Extreme class divide, and a ton of political machination. Granted, this is present in Dwarf Commoner as well, but there's a rags to riches vibe in that, and you don't get to see quite as much of the upper crust end, and instead see mostly the seedy underbelly. The schemes are still present for both, but the atmosphere is different.
The city elf, especially the female city elf origin, is incredibly dark, and really underlines the extreme oppression that the elves face. While I found the future treatment of elves to be somewhat lacking compared to what elves allegedly face in lore, the CE origin provided more than enough to compensate. You see what life is like as one of the wealthier members of the alienage. There's a strong sense of community that is pretty endearing, and it helps balance out the crushing poverty and subjugation. After all that, the player (may) violently resolve the situation, and I have to say, stabbing Vaughan was the most satisfying thing ever. Even more than offing Howe.
So, that was long, but yeah, those are my favorite two. Next would probably be mage and human noble. And the bottom are the Dwarven commoner and Dalish Elf. The Dalish Elf had too much of a Princess Mononoke vibe for me. I love Mononoke, but I definitely saw it as a very obvious source of inspiration. Not really sure why I couldn't get into the Dwarf Commoner origin.