Heroes: Dissidia Duodecim Final Fantasy (Hey, don't complain, this leaves out tons of great characters, including most of my all-time-favorites)

Villains: Final Fantasy VII (strong, well developed cast of villains)

Stat Customization System: Final Fantasy X (Sphere Grid)

Ability Customization System: Final Fantasy Tactics Advance (Job System)

Battle System: Final Fantasy X-2

Sidequests: Final Fantasy Tactics A2: Grimoire of the Rift.

Story: Final Fantasy XIII

Story Presentation (Pacing, depth of development, and introduction of key elements): Final Fantasy VI

World Setting: Final Fantasy XII (Ivalice)

World Presentation (World Map): Final Fantasy VIII

Music: Theatrhythm Final Fantasy (Ok, this one might be cheating a little)