Lessee here, from DA:O; Shale and Leliana.
Shale was just hilarious. I found her hatred of pigeons especially endearing. Unique little quirks like that can go a long way toward making a character relatable and memorable. I just got one word to sum her up: EPIC!
She might even be my fav out of them all! She and my Warden are so bff's. I miss her so much.
I loved talking to Leliana. Though I disagree with her regarding the Chantry, my Warden really hit it off with her. My favorite parts were when you gave her the nug and when you got to talk to her about shoes. "Sometimes a girl just wants to have pretty feet." Made me feel delightfully girly and gave me all the warm fuzzies. I definitely want more of that.
I relished getting to kill Marjolaine. That wretched, vile, evil stain on humanity! How dare she hurt my sweet, precious, adorable Leliana?!
NNNOOOO!!! NOT OKAY!!! Bad Marjolaine! Very VERY BAD!!! Friend or romance, I just can't get enough Leliana.
From DA:II; Varric and Merrill.
C'mon, who doesn't love Varric? He's just so darn likable. He's everyone's bro and you all know it. He's just so sweet and easy going. Never have I come across another character or real life person who's so gosh darn easy to talk to. He's got a genuinely good heart, and I love how loyal he is. I also found the dynamic between him and Merrill downright precious. Just wanted to initiate a group hug every time they were in the party together and would start talking. The feels! He's obviously only ever gonna be a friend thanks to his painful past. While I can accept that...in the words of Isabella, "But the chest hair..." 
Speaking of which, Merrill! Cutest thing ever! I just adore her! I especially loved it when you had her, Varric, and/or Isabela together! Oh lawd. Funny thing is, there were a couple 'o times I was just as confused as Merril about something. Guess maybe that's why I like her so much. I can also be somewhat dense and naive...also stubborn. We have that in common too. As for friendship/rivalry or romance.....meh. It's a tossup for me. Liked her as a person more than I liked her relationship with Hawke regardless. If you supported, she remained obliviously rooted in her own stubborness. Rival her, and she beats herself up way too much. "Don't try to save me.." Save you? You made one lousy mistake with that dang mirror. It's not like you're a terrible person in need of redemption! All you needed was someone to really listen and provide some real guidance. Yeesh! The Keeper of her clan wasn't any better. Not only did she refuse to trust in Merrill's judgment, she went so far as let herself be possessed when, ironically enough, she was trying to protect Merrill from the same. Way to go dumb dumb. Now poor Merrill has to live with that on her conscious and your clan is without a Keeper!
*facedesk* Really wish the game had given me an option to put them all in their place, verbally speaking of course. I wanted to tell all those stupid elves off so BAD! This is this and that is that now kiss my...
Since I don't know all the characters being introduced in Inquisition yet, I'm going to reserve judgment for the time being. I have a feeling, though, that I am going to adore Dorian. Oh, my curly stache! Fuhget Ser Beefcakes! Mmm, mmm, mmm. I can't be the only one who could just sit there all day staring at him and have the best day ever, can I?
Why are the hottest ones always gay? Meh, here's to hoping Iron Bull surprises me and actually grows on me. I ain't romancin a Warden! 