Did I change my preconceptions about the party members? Yes, I absolutely did, for the most part. A lot of the characters I thought I would hate became likable and a lot of characters I had high expectations for tended to fall flat for me.
Cassandra: I actually didn't change my opinion much about her, and that's because I didn't really feel too strongly about her one way or the other in her previous appearances. Though, I have to say Cassandra vs. Varric has got to be one of my most favorite scenes ever in the DA series.
Varric: I actually liked him more in this game than in DAII. I thought he was dull in DAII, but I love the seriousness he's picked up along the way.
Solas: I thought he was going to be a bore, but I'm really loving how thoughtful and intelligent he is. He also has some pretty neat stories to tell.
Sera: I didn't think she was going to be anything special, but boy, was I wrong. The girl is TOO much for me, and not in the good way. I like her pranks, but she tends to confuse me most of the time and leaves a bad taste in my mouth.
Vivienne: I expected much more from her than what we got. I thought she was going to talk more about the high life and her social status, instead she always drones on and on about the silliness of the apostates and the importance of the Circle, which became tiring very quickly.
Blackwall: He absolutely left no impression on me when I first saw him and I thought he was going to be bland and forgettable. Now, he's one of my most favorite characters in the entire DA series and he's going to be the first character I create a female for in the DA series just to romance. He also has a pretty cool voice, and as much as he cares about being a goody-two shoes, he speaks much more brusquely than I would've expected from similar character archetypes.
Iron Bull: I knew I was going to dislike him, and I do. I haven't done his personal quest, so I don't know how his character will progress, but I just really dislike the Bull. He comes across as a typical dudebro douchebag with a little sprinkle of soft-heartedness thrown in there, and it just does not work for me.
Dorian: Like Vivienne, I had high hopes for him, but his arrogance irritated me to no end. We get it Dorian, you're the cat's ass but you don't have to constantly go on about yourself! Not only that, but I expected him to talk more about Tevinter's positives, but apart from a line or two, everything about him was all about trying to save Tevinter from itself, and like Viv, it got real old, real fast.
Cole: Surprisingly, I really like him! His voice actor knocked Cole's demeanor right out of the park and made him a joy to be around. I really didn't expect to like him, but he really is fairly adorable and earnest, and his conversations with the other party members are just cute. I also thought he had the best personal quest from the ones I did.
Cullen: I don't really have any strong opinions about him.
Leliana: I found her kinda boring in DAO, but she was really fun and interesting in this game. It was nice seeing a fairly pious and devoted Andrastian question her beliefs, and to see how her bond with Justinia really affected her after Justinia's death.
Josephine: I didn't really think I would like Josephine because she seemed kinda boring, but I actually think she's pretty neat. She still isn't the most interesting person ever, but she has enough personality and story to make her somewhat noticeable.