Final Fantasy Dissidia actually had some footage released recently, ahead of it's projected December 2008 Japanese release date. Dissidia is described as an action-based fighting game with RPG elements and featuring two characters from each of the first 10 games, a protagonist and a villain. Overall, though, it's likely to be the FF answer to Super Smash Bros. in that it features a number of characters from different universes fighting each other, and there might even be a plot this year.
What is known, is that the character list has a number of confirmed cast members. Not every game has both characters revealed yet, the bad guys being wheeled out for some games, but in those cases it's pretty blatant who the "Other" one will be, and in one case, the other one is a bit puzzling really. It's probably a safe bet to assume that on top of these 20 there may be secret characters as well, but don't count on it. And without further ado, here are the ones you can count on seeing.
From Final Fantasy: Warrior of Light and GarlandThe Warrior of Light and Garland, though both fighters, have some differences. The former uses swordplay and shield, a possible balance between offensive and defensive play, whilst Garland has a sword that can become a battle axe, for an ever changing but from the look of it offence-heavy fighting style. The arena where they fight appears to be the Chaos Shrine, location of the final boss battle of Final Fantasy.
From Final Fantasy II: Firion and Emperor Mateus PalameciaFirion's fighting style seems to revolve around versatility, able to change weapons mid-battle. He has access to swords, spears and bows amongst other weapons, a veritable walking armoury. Mateus meanwhile appears to use magical attacks predominately, and is able to transform into the Emperor of Hell. Their battleground seems to be Pandaemonium, capital of Hell and twinned with Cardiff.
From Final Fantasy III: Onion Knight and Cloud of DarknessThe Onion Knight is apparently able to change jobs mid-battle, with Sage and Ninja confirmed so far. Others are likely, but only those are confirmed. The Cloud of Darkness meanwhile is, in case you didn't know, actually a woman giving Ultimecia a run for her money in the "ridiculously revealing costume" stakes. Her appearance has altered to have pale instead of orange or green skin, but she can apparently transform into the green-skinned variation seen in FF3 DS. The fight between the two occurs in FF3's World of Darkness.
From Final Fantasy IV: GolbezConfirmed in a trailer at Square Enix's DKΣ3713 event (The name referenced the games displayed and also is a fun game to guess exaclty which games it in fact had at it! Don't google, that's cheating.), nothing has been revealed about Golbez except his presence but it's likely he'll fight Cecil.
From Final Fantasy V: ExDeathLike Golbez, nothing confirmed and revealed only in the trailer at DKΣ3713. Likely to fight Bartz.
From Final Fantasy VI: KefkaKefka's confirmation in the game came at, you guessed it, DKΣ3713, and tells us the same as it told us about Golbez and ExDeath, except that Kefka apparently hints at his opponent being female. It's probably safe to bet it's not Relm or a post-op Locke.
From Final Fantasy VII: SephirothNo one should be surprised at this one. His opponent hasn't been announced but really, who was it the other seventy times they put him in a sequel or spin-off?
From Final Fantasy VIII: Squall and UltimeciaGunblade-wielding social recluse mercenary Squall fights with his Gunblade of course, and can use his Renzokuken attack as well as transform his weapon into the Lionheart. Ultimecia meanwhile uses swords and axes made from magic, as well as time manipulation and possibly even summoning and junctioning. Their battle occurs in Ultimecia's castle.
From Final Fantasy IX: Zidane and KujaThe rules are simple. Two Monkey Enter, One Monkey Leave. The Genome brothers face off in Memoria, and apparently both use their Trance forms in combat.
From Final Fantasy X: Tidus and JechtYeah, you read that right, Jecht. Not Seymour. Tidus fights his dad with his overdrives, whilst Jecht can transform into the Final Aeon, which might actually explain this somewhat bizarre pairing. The creators have stated they seek to use this as a "What-if" scenario as well as expand the interaction between the two characters.
From Star Wars: NobodyAnd hooray for that.
Sources:
Official SiteIGN videos and information on the game