I - Matoya - Some of her lines are fantastic, really. She insults the party!
II - Firion - I don't remember the slew of extra characters, but I didn't mind Firion as a hero.
III - Onion Knight
IV - Cecil - His personality develops through the story rather well. I haven't finished it though so who knows
V - Galuf - He's an old dog trying to do the job he already did however many years ago it was. And then he dies, protecting his comrades.
VI - Edgar - :edgar: He's a great character and I found him to be funny throughout, with of course his nice sacrifice for Sabin
VII - Cid - He's just too badass man. And I get teary when I think of him finally achieving his dream.
VIII - Zell - He was lame and annoying but I liked him better than Squall. Squall pissed me off with his behaviour a lot of the time.
IX - Vivi - His story the whole way through is amazing, and I loved him in battle.
X - Auron - He's like a combination of Cid and Galuf. So go read their descriptions again
XII - Balthier - Mr Charming. I couldn't resist him guys