Ember and Cam or Seelah and Darien have some juicy dialogues too.
Now that i mention her, I think Ember has banters with anybody in the beta =D. She is a strange character, but if you read what she is saying she makes more sense with her babbling than many others. She has some interesting banters.
Regill is also a must, it would be great if you can pick him sooner like Arueshalae in the game. Bet he would have something to say about Kenavres.
I dunno about the characters per se and the writing, that could be a matter of tastes, but what i can safely say is that i am enjoying much more the stories and banters of the characters in Wotr than the ones of Astarion or Wyill. They are better merged into the main story IMHO.
