I have a montley crew of the odd balls of the Final Fantasy 6. who is your crew of choice when you need to throw down?
Gau one of the best charaters in the game if you know how to utilize him properly. I have him with 100% magic block and 255 defense and 255 attack. There are only a couple of attacks that can do him damage... Dice and Non-elemental non blockable magic seem to be the only things... If you master his rages he can be extremely useful.
Setzer is also powerful because he can use the Fixed Dice. I equip him with the offering. Because the fixed dice have nothing to do with strength Setzer becomes a powerful mage. He is a well rounded charater who is the only one who can defeat Gau and Mog with a physical attack.
Mog because like Gau he can have 255 defense... Which makes him immune to physical attacks... Not as powerful as either Setzer or Gau but he does have a strong defense.
Relm and Strago I use to decurse the cursed sheild... simply equip with a a heal rod... Presto they become an asset rather than a Liability. These two I like to use in tandem to control a monster in order to learn his magic. They are both great mages... I don't know which I like more.
Locke is a quick charater and he can steal, which makes him very usefull. I equip him with an Ragnorok Sword. If I were in a battle against someone elses party I would use him to take out someone like setzer...
Umaro I use in the Tower of Kefka's cult. Equip him with a gauntlet and he ain't half bad.
Gogo I use as an Imp with Rage, Steal, Magic. Also very useful but I dislike his major lack of stats.
Shadow isn't useful for battle so much as he is a kick ass dude. His Speed is a great asset. But he isn't that great at defense or offense. But he can mug with the theif knife. which is useful when your party must split up
Terra is useful because she can morph. But i don't ussually use her all that often.
Least useful charaters are Edgar, Cyan, Sabin, Celes... in that order.
They all just gather dust...