... totally reorganizes everything - sprites, jobs, abilities, item attributes event data - so that there are no redundancies? I'm asking because I vaguely remember that someone did some hacking so that the duplicate Agrias, Gafgarion, Rafa, Malak, and Alma sprites were freed up. I think they did some event editing so those characters could all use the same sprites without messing up.
I don't know about one for jobs/abilities/event data but this one reorganizes Item and Status attributes: http://ffhacktics.com/smf/index.php?topic=6450.0
The reason for my question was a question someone asked me, since they wanted two chocobo sprites in the game, so they can have 10 different colored chocobos. I figured if someone can get the game to use one sprite where it uses two for people like Alma, Agrias, Celia, Lede, Rafa, Malak, and Gafgarion, then they could have their wish.
They would need to change the Formation Screen sprite and portrait as well, just for starters (and I have no idea how that palette stuff works for the monsters, or if it just doesn't, and they each have separate Formation Screen data spots!) - you'd be best off just replacing the Simon sprite, as he's one of the few characters who has a spot in the Formation Screen data, and then latching his old sprite onto the unused Celia or Lettie sprites.
Unless you use the PSP, then you have to get rid of Valmafra or Orran, since Simon's sprite is too large.