-Cloud Strife
-Yuffie Kisaragi
-Tifa Lockhart
-Sephiroth
-Crono
-Grobyc
-Master Monk Yang
-Edge Elban
-Sabin Rene Figaro
-Cyan Garamonde
-Shadow
-Selphie Tilmitt
-Zell Dincht
-Amarant Coral
-Rikku
-Auron
-Volt Krueger
-Kou Leifoh
-Sion Barzahd
-Dauragon C. Mikado
-Echidna

With all these characters, a good fighting game could be in the works. And I know that I used some non-Final Fantasy characters in this list, but they're all Square-Enix characters.