For me, Millie (Jamie and Liz' mother) is frustrating, since she has refused (so far) to even sit down and listen to each of your sides. Hannah (Eden's "stalker") is just annoying, especially after hearing Eden's side of it - and after hearing about it, seeing their interactions on TV (whenever this comes up) makes you feel Eden's frustration even more.
Kimmy was annoying at first, but after finally getting her to open up to you, you can maybe understand why she directed her anger towards you. This also had the opportunity to make her understand that you're actually on the same side, with a common "enemy" (Charles). Beyond that point, the only annoying thing about her, is the fact that most of her appearences show her mascara running down her face from crying - I hope this stops in the near future.
Mackenzie is more of a wildcard, since we don't know what the heck is up with her attitude. I hope we also get to the bottom of this soon.
The thing about Damien is just sad. His betrayal cuts deep, but even if you can understand his reasons for doing it, doesn't make anything right. I wouldn't say I hate him, but I would say that I can no longer trust him regarding anything. You can only hope that he learns from his mistakes, wherever he might spend his future, as long as this no longer involves you or anyone you love or care for.
And regarding Harper, I'm not 100% sure if I'd want anything to happen with her, romantically. I enjoy her as a good friend and co-worker/partner, but I hope the romance won't be pushed on her. Of course, if she outright says she wants something more, I'd let her in, but I'd prefer if this decision isn't pushed on her in any way.
For me, the best girlfriends are Jamie, Shauna, Bailey, Liz, Natalie, and now Stacy. I hope Rainn also comes into the mix, via Bailey, in one form or another. I also hope to see more of Jasmine, Zoe, Yuki (Kimmy's sister), and Alexis (the waitress we met while on Azel's last date before we moved). I'm looking forward to Carly coming more out of her shell to MC, and lets MC show that she's on a good path, and that she doesn't have to be afraid to talk to MC while on her way to weightloss and better health.