FF 6: Mog.
FF 7: Tifa
FF 8: Zell.
FF 9: Steiner. Powerhouse. Holy god.
FF 10: Lulu/Yuna.
FF Tactics: Beowulf. Always. (Duh.)
Star Ocean 2: Bowman.
Star Ocean: Til the End of Time: Albel.

Sure, I know the last 2 aren't final fantasy...but they are square-enix