Raina. She's great. I think she displayed incredible inner strength in a time her entire world has gone crashing down around her, when everything done was meant to break or intimidate her, though many times I wanted to reach out and whack her on the head thinking "speak up!". When she first said "I will be chief", I remember I put the book down a few mins to cheer her on. Silly, moreso considering I'm not a kid or teen but I did. She is gonna go crazy clearing house (hopefully)

One way or another her story will probably really turn around in book 4 the way it ended in Red Ice and I can't wait.
The only bummer about Red Ice..leaving me with a cliffhanger in her chapters haha!
Vaylo. It felt like he started as badguy side character, not really depicted as the most likeable guy..but I've been rooting for the old man. He's grown into an awesome character with wit, wisdom and heart in a fierce shell. He's definitely gotten my interest after just a few chapters.
Ash. She is just..lost. Doesn't know who she is, what she is, where she is. Insecure and it shows, but at the same time incredibly stubborn and learning. She's got a brain. She could be frightening in many ways, as she has shown before.
The Sevrance pack.. I admit I had to let Raif grow on me. I wanted to punch him in the face so many times for all the bullheaded things he did (and does) but it is a perfect display of his age, the way he was raised and all the things he just does not know any better. I still want to kick him, but he's learning, evolving. I like him more now.
Effie..I adore the kid and the lighthearted way her chapters are written, its a nice contrast and blends in surprisingly well. I really feel like I'm in the head of a 9 year old. She's the smartest of the three I think and already lived through some pretty harsh times..without losing her smile!
Drey.. is blind. Too stupidly loyal. At least Raif spoke up of things. I believe to remember he came to some sense in book 2 but its been awhile and his role in book 3 is kinda small which struck me as a bit strange.
As far as side characters go, I dig the Sull, all of them and I can't wait to see what Angus Lok is going to pull out of his hat. A man hell-bent on vengeance with nothing to lose isn't a pretty thing. Especially considering who and what he is.
On the flipside for the badguys, Marafice has grown from thug I had no interest in into interesting bad guy who may implode on his own ambitions and I'm curious where his road leads. Baralis intrigues me, partially because I don't know his past but he made me go "oh shit" regardless.
And finally, to stir things up I have to mention Mace.
I
despise Mace Blackhail. He is slime, scum and worse..and so damn smart about his plots. I have not felt such hate for a fictional character ever before. The typical badguy may make me go "damn..that was nasty!" but the kind of thoughts he produces are something else.
Any character able to get that strong of a reaction out of a reader (be it good or bad) deserves a mention. I admire the way he is written as the only (big) character the reader is denied a personal perspective of, it just makes him so much more.. chilling. I think he is a brilliant piece of writing, it adds tension and twists to the story. I like that. However I still want to stab him in the eyes. With a rusty knife. Him and all his Scarpe cronies.
There are so many others of course..but those kinda stick out to me.