I've heard nothing but good things about Sera in tresspasser.
Unless you mean "Changed their life single handedly and have them wrapped around your little finger" as a character arc. I love how vivienne doesn't really change much.
Sera was the only party member I didn't have full friendship with, and consequently got no scene with in Trespasser, so I admit she may have improved, as the person below says. But no, that's not at all what I consider a character arc. That's not my problem with Vivienne. She doesn't overcome anything or evolve as a person in any way. Josephine doesn't really either, unfortunately.
She stops being jugdemental in Trespasser. She even tries to be nice to a Lavellan that romanced Solas or after she finds out about the truth of the elven gods. I think all companions were good by the end of the day, even if some had a shaky start. Minus Vivienne that is, she changed nothing and is the only one causing trouble instead of doing something honorable or productive.
Yeah that cure to keep that offscreen that we haven't seen the results of yet? That was to give them something to do (much like sending Hawke to Weissaput).
Poor Hawke. Well I don't have any single Hawkes so that won't work for me :X Plus even in that case there's still the siblings left alive.
Nah makes sense Dorian would see slavery as acceptable if he grew around it. It's sadly natural.
Sends Warden off to find a cure. Comes back after the game, no information about cure.
Sends Hawke off to Weisshaupt. Comes back after the game, no information about Wardens.
Hmm...
Anyway, yeah, poor Hawke. Though out of my forever alone protagonists, Hawke bothers me the least. She is enough of an awesome person on her own, whereas I felt like the Inquisitor wasn't as fulfilling or interesting without a romance. But yes, she does have Bethany alive.
Yeah, I can see Dorian thinking that way. I'm just... I don't know. A small part of it rubs me the wrong way.