I found Karia to be very interesting, mostly because we knew a bit about her form the last book, but only in passing. Seeing how her life was after having been so used was bad, she was hanging on by a fingernail and it wouldn't take much to make her fall. What she didn't realize is that she had some powerful allies, they just needed to talk to each other and realize who Karia was to each of them, when that finally happened, I found myself laughing.
I found Karia and Trick to be an interesting pairing, wasn't sure they were going to work, but they did. I'm glad that both of them fought for their relationship when it really mattered. Loved how this one ended, both in the present and the future.