My favs. are Cloud, Leon, Tifa, And two of the three Heros (Sora, Kairi-missing!)
Preparing to be yelled at for being a Sephiroth Fanboy (which I am not)

I think Sephiroth was awesome in this series because of the way they made him fight. It was awesome to se Sephiroth fly all around you, and teleport, to confuse you, and use his awesome killer attacks (Meteor, Flame pillar, etc) It really brought life to the battle and I think that it was one of the coolest fights I've ever had (in both 1 and 2)