Garm Bel Iblis comes in a close 2nd, IMO, and was also the only flag officer in the New Republic who had a chance of fighting Thrawn to a draw. Talon Karrde was another character who received a fair bit of development in the EU novels.
I started reading the Yuuzhan Vong novels, but quickly got bored with them. IMO if you can't finish a Star Wars story in a trilogy there's no sense writing it. Perhaps 3 or 4 separate trilogies covering different parts of the Yuuzhan Vong invasion would have been better. As it was, it was more like a never-ending Star Wars soap opera.
_________________________
Phil
"Can I tell you something?
Got to tell you one thing.
If you expect the freedom
That you say is yours
Prove that you deserve it
And help us to preserve it
Or being free will just be
Words and nothing more"