So I've come around to rewatching Gundam Seed Destiny for the first time since 2007, simultaneously disproving the existence of both a merciful God and my manhood, as a merciful God would not have allowed that travesty of a show to be made, and a man with self-esteem would probably not subject himself to that torture TWICE.
That said, I have come away with brief opinions of the two most promising characters of the entire cast.
First off, Shinn Asuka, or: "How to waste a perfectly good protagonist"
Shinn Asuka was such a case of wasted potential. He's possibly the most violent Gundam protagonist to date, and could have had such potential in terms of character development. It's a shame the writers of Seed Destiny decided to basically toggle his hero/villain status depending on Kira's presence in the scene. Kira not here? Shinn's the good guy. Kira's here (which only happens more and more as the series goes on)? Shinn's the bad guy. The whole series should have been done from Shinn's perspective. It was a nice change of pace to have a Gundam main character who had more demons than angels, and who for once thought mankind was ultimately depraved and needed to be "fixed" rather than "encouraged". They could have favored a story arc near the end where his character becomes more like a traditional Gundam main character and his opinion of humanity improves, but that was wasted in favor of using Kira Yamato instead during the second half, relegating Shinn to a dual hero/villain role depending on what the episode needed at the time. Basically, first half of Seed Destiny? Awesomesauce on an Awesomeburger between two Awesomebuns. Second half? FAIL. Sheer SHINNsurmountable epic FAIL.
Now then, the other character: Meer Campbell. Alternately: HOLY FUCKING SHIT THIS CHICK IS AWESOME.
Some background on her (from the Gundam Wiki):
Meer is contacted by Chairman Gilbert Durandal, who asks her to pose as Lacus. After she accepts the job, Meer's face is surgically altered to look identical to Lacus.
...
Since Lacus has greater political influence than he does, Durandal uses Meer to gain support for his policies. Meer believes in Durandal's ideals, and agrees to further his agenda by impersonating Lacus.
However, the series also establishes that part of her reason for agreeing to do it is because she looked up to Lacus, and wanted to be like her, and so in a extreme case of hero worship, tries to be like Lacus a little too much while failing to understand what made the real one unique and special (in theory; Lacus as she's actually portrayed is one of the flattest and two dimensional Mary Sue characters in any Gundam series).
Meer ended up being done pretty goddamn perfectly, actually ending up a stronger character than Lacus, in terms of her character progression (degression?), and her resulting psychological destabilization. At first, she's all like "HEY! I get to honor this singer I really like by filling in for her!" and then she got to "Hey! Being famous sure is cool! I could get used to this!" which then sank into "I have her voice, her talent, and her face! I'm pretty sure I can be her, only even better!" and finally she degenerated completely, and starting believing her own lie, buying into the idea that she actually WAS Lacus, only snapping out of it when she met the real one. And Lacus being Lacus (ugh. Getting that chick to be vindictive or even irritated is like trying to tell water not to be wet), she took it like a pro and forgave her in Meer's last moments, bringing to an end probably the best realized character of the entire damn show.
It helps that Rie Tanaka voices Meer. It helps a lot.
Honorable mentions for awesome characters are Gilbert Durandal, who is probably my favorite Gundam villain EVER short of Char Aznable (ironically, they share the same seiyuu), and Heine Westenfluss, as another case of a wasted character with great potential.
No clue why I posted this.
I guess Gundam fans can squabble now, or something.