Well, the one I consider the best is probably left out of the festivities: I loved the gameplay and style of Final Fantasy Tactics, but the story was what made it memorable for me. One of the best storylines and some of the greatest characters in a game I've ever witnessed.

My favecharacters from every FF I played:
FF - Black Mage
FF4 - Kain
FF6 - Edgar (in combat), Kefka, my fave playable character is probably Cyan
FF7 - Cid &#!@% Highwind
FF8 - Irvine, Seifer until he became a puss towards the end.
FF9 - Blank, the main characters all pissed me off
FF10 - Auron
FF12 - I suppose it'd have to be Basch.
FFT - Delita Hyral, also really loved Wiegraf and Mustadio
FFVIIDC - Vincent