Hmm... For personality, my dwarf noble was a cocky, rough and tumble, yet pragmatic when he needed to be, and he didn't really give a damn about the humans and elves. Sided with Harrowmont during Orzammar, sided with Caridin, had Zathrian end the curse in the Brecilian Forest, saved the mages in the Circle, sent Wynne into the Fade to fight the desire demon that possessed Connor, double-crossed Kolgrim and preserved the Ashes, killing him afterwards, and convinced Eamon to send Jowan to the Circle. Made hardened Alistair marry Anora and did the DR with Morrigan. As for the companions, hardened Leliana, lied to Morrigan, found Aneirin, killed Taliesen, gave Goldanna 15 sovereigns, found Sten's sword, helped Oghren patch things up with Felsi, and no romance. Didn't have any of the DLCs for DA:O at the time. In Awakening: fully upgraded Vigil's Keep, recruited everyone, saved Vigil's Keep, didn't kill the Architect, Nathaniel stayed, Anders 'stayed', Velanna left, Justice 'stayed', Oghren stayed, Sigrun stayed. Class: Berserker/Champion/Guardian S&S warrior (I know, I'm so unique).
(ok, you know what? I'm just going to stick with personalities from here on out because that's my canon playthrough and most of my playthroughs are pretty similar when it comes to the major choices)
My dwarf commoner was a bit snarky and somewhat cynical. She was also a bit more pragmatic than my dwarf noble, but she was very protective of Rica, and thus sided with Bhelen in Orzammar. Again, no romance. Class: Duelist/Assassin/Legionnaire Scout dual-wield rogue.
My first Dalish elf- which was also my first playthrough- was more diplomatic and pragmatic while still being fairly helpful. tbh, I'm not entirely sure how to continue describing his personality. Romance: Leliana. Class: Duelist/Shadow/Legionnaire Scout dual-wield rogue.
My first elf mage was mildly snarky, diplomatic, a little naive, and had an 'anything goes' mentality when it came to fighting. Romance: Alistair. Class: Arcane Warrior/Blood Mage/Battlemage archer mage with S&S back-up.
My first city elf (shown in my profile pic) was mostly serious, hated humans and the Chantry with a passion, and was very pragmatic. He was very tactical and he was also very protective of his fellow elves and quickly became friends with Shale, Sten, Oghren, Velanna, and Zevran. He eventually started to trust Alistair as a comrade-in-arms, but I don't think I'd consider them to be friends, exactly. He could be snarky at times, though it was very rare. No romance. Class: Berserker/Reaver/Spirit Warrior 2-hander warrior.
My human mage was fairly naive, not exactly a fan of fighting, and she was pretty pro-Circle, unlike my first elf mage. Meh, not much else to say about her. Romance: Leliana. Class: Spirit Healer/Shapeshifter/Keeper mage.
My current human noble (not going to count my first Cousland because I deleted him) is fairly snarky, diplomatic, pragmatic. Still fleshing out the details on her, tbh. Romance: Alistair. Class: Bard/Assassin/Shadow archer rogue.
My current Dalish elf is somewhat snarky, mostly diplomatic, doesn't exactly trust humans, and is a bit of an idealist. Romanced Zevran with her because they had both lost someone they loved (Tamlen for my Dalish) and were both kind of numbed emotionally because of that. Class: Ranger/Duelist/Shadow archer rogue.
My current elf mage is somewhat snarky, self-confident, pragmatic, a little arrogant, and pretty anti-Circle and anti-Chantry. Again, I'm still fleshing out the details. Romance: Morrigan (if my PS3 finally lets me complete a playthrough where I romance her). Class: Arcane Warrior/Shapeshifter/Battlemage S&S or 2-hander mage (still trying to figure out which one I want to go with).
My current city elf is very snarky, proud, somewhat cocky, diplomatic, and a bit rough and tumble. Yet again, I'm still fleshing out the details. Romance: Alistair. Class: Berserker/Reaver(or Champion)/Guardian dual-wield warrior.
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Yeah, I know that they're not very detailed, but it's late for me and I'm not in the mood to flesh out all of them with their backstories atm. Maybe I'll come back later and add more details, but no guarantees.