Reading the OP I was shocked how many characters I'd forgotten about. I don't even remember Hope and Fang in the slightest, and while I remember his design I can't recall Sazh's character at all.
Lightening I remember because protag and prominence, and Snow because of the LR demo cutscene, the rest of the cast are gone from memory. I have no idea who the antagonists are, main story NPCs, etc...
All I really remember is the battle system being slick, and the music and visuals stunning.