Hairstyle: Seymour. Obviously. Or half the FFX cast, really.
Practical Costume: Kuja. Obviously.
Slums: Midgard did have some quality slums.
Villain Motivation: Kefka or Kuja.
Stereotypical Character: I can agree with Yuna.

Anti-Hero: Does Gilgamesh count? Shadow works too. And Delita.
Standard Battle Theme: Maybe FFVI's?
Side Stories: Most of FFVI's side stories. And most of FFVII's too.
Comic Relief: I liked Quina.
Plot Twist: Basch's. Evil. Twin.

(But really, I was pissed.)

Best Ultimate weapon: All of the "Ultima" weapons are lightsabers, so those.
Best character themes: Aerith's was always sort of touching to me.
Final Villain's pawn: Gilgamesh, Weigraf and FFVIII's Biggs and Wedge, if they count. And most of Shinra Corp, but they don't really count either.
Side Quest: Getting characters at the end of FFVI. I enjoyed that.
Best use of Moogles: Mog.