As of now Shadowheart is pretty much my second favourite character of the followers. Sure, her name is ridiculous, she's a fair edgy Mary Sue and suffers quite a lot from main-charactritis, but she seems to be the most interesting and well-written character of the lot. It's pretty well communicated that she's shit at being evil. She doesn't like getting involved in things that doesn't concern her but doesn't like to cause people harm if it can be avoided either. The drunken regret scene after the Grove Massacre was a nice touch. It's very nice to have an evil character who isn't Stupid Evil.
My favourite is still Gale, though, just because of his immediate friendly and charming demeanour (arrogance aside). It was particularly nice to have somebody actually compliment you when he likes what you do as contrast to the three assholes in the group who mainly whine. I agree that something seems off about him, though. I hope it's not just narrative disconnect.