what did you do to give your Dalish character some individuality?
That's a hard question to answer as I can't really pinpoint one specific thing I did to make her unique... but early on, Solas says that your clan is different than most in that they thought it was important to know what was going on outside of the daily life of the clan (in sending you to observe the conclave). So, I felt like at that point, the game was indicating your character probably comes from a different background than traditional Dalish, so you could do pretty much whatever you wanted with your character.
How does your character feel about City Elves? I don't mean everyone in alienages, but those who worship the Maker or that managed to find a place in human society. That their own kind would turn Andrastian and/or reject their own history is bound to be shocking to them.
Going off the idea that my Lavellan's clan was interested in the workings of humans and things going on in the world outside of the clan, I think she would have learned about city elves and that they worshiped other gods and had other lives. So, they didn't surprise her at all, and there's no I'm-a-real-elf-you're-not complex with her because her Keeper didn't teach the clan that way. She was brought up believing that we're all part of this world and we must learn to respect each other, kind of thing.
I also had my Lavellan grow to accept the Maker through the course of the game. At first, she denies the Maker and being his chosen. But as she survives crazy thing after crazy thing, she's starts thinking it must be divine intervention. And since the elves believe that their gods have left them... of course, she turns to the god everyone is telling her about. Also, since elves believe their gods we created when the world was and didn't create the world themselves, it's not a contradiction for a Dalish elf to believe in both elven gods (created with the world) and the Maker (who created the world and possibly the elven gods as well).
Solas or Cullen?
Solas. And in all honesty, I think who you romance depends a lot of who you're more attracted to as a player. But if I look at it from a story perspective... I do think my Lavellan is very interested in restoring the elves or at least bettering their position in Thedas. She purposely let's Celene die and puts Briala on the throne in an effort to achieve this. And in that way, I think her and Solas have that kind of do-whatever-it-takes ambition going on.
How was your character's interaction with Dorian?
Given that Dorian purposefully left his homeland and defied his family to help the Inquisition and set the world straight? We got on really well. She's not going to judge him for doing the right thing or hold a grudge against him for something that happened hundreds of years ago that he had nothing to do with.