This hack lets you play as any of the above named characters.
It can be edited to replace anyone by bannon, the green imperial soldier, esper terra or the merchant from south figaro.

I picked up this idea from the slickproductions forum, big thanks to lenophis for helping on this.

Kefka's robes are mainly equippable by anyone since I think he's genderless (haha). Leo's armor can be equipped by females as well as males since Leo has a bond with both Terra and Celes. The imperial suit can be equipped only by males (including Mog and Gogo), while the Ghost Suit can be equipped by anyone BUT the character becomes an undead.

Celes has the Ghost suit, and she cannot be revived nor healed in battle.