I found Sara interesting, but really a minor character as far as development. (IOW other that not getting either the prince OR Tor she wasn't tortured much)
Quite a bit less development than Colette as long as you are just into pretty blondes.
I mean during the first book when we were led to believe that the story was going to be a fairly tame fantasy trope she was mainly the girl that the Prince was seeing who was too low station for him.
I mean she always felt to me to be more an "asset" than an actual spy. She never was asked to do anything similar to what Trice did, for example. (Giving up her relationship with Tor the first time so painfully, acting as a prostitute, running the geraint operation, ect..) Joining the military as a messenger/pilot ect... its not something she might not have done anyway. Only place she didn't really fit in so directly was the trip in the boat.
Of course we only ever SEE two merchant houses and the other one is a Assassins Guild. Still a bit uncertain how the Merchant houses fit in between the very small minority of nobles and commoners given the later disclosures about the social engineering between Green and Cordes.
She probably DOES have an interesting viewpoint, though. We never really see the world through someone who actually ISN'T noble.
