I like all of Ethel's class and deity-specific lines, so it's often a highlight.
I also like Minthara's romance prelude tadpole scene, because it's one of the rare times you get to give your character some characterization by saying rather than doing. I don't enjoy that kind of writing normally, but how completely unsubtle it is feels to me like a good contrast with the rest of the game
Dealing with Z'rell is fun, too. Learning about her many husbands and stringing her along as an evil avatar have been delightful.
I'm curious now if there's much special dialogue options in act 2 for shadow magic sorcerers, and I look forward to quests in the shadow curse that can give Nimbus a chance to shine. I haven't been pkaying much shadow sorcerer, though.