Kate is one of my favourites in the entire show. I do think they floundered with her character in season two, and I understood Angel being weary and irritated with it all, but I always sympathised with her. (I also shipped her with Angel hardcore, but considering how they handled Cordy/Angel...it's probably best they didn't go there.) I wish she'd at least been mentioned after leaving, so we knew she wasn't dead in a ditch somewhere or something.

Justine was just kinda there. I don't know why, I was just never engaged with her, despite the fact that I usually like that character type, or at least care about them.

Gwen was fun, Lilah kicked progressively more ass as time went on, and Darla is probably my second favourite Fanged Four family member. (First being Angel himself.) Though I'm STILL not sure how "I have a baby and his soul is affecting me" works.