FF1:
Warrior of Light
Garland

FF2:
Frioniel
Emperor

FF3:
OK(Onion Knight)
COD(Cloud of Darkness)

FF4:
Cecil
Golbez

FF5:
Bartz(confirmed)
ExDeath(confirmed)

FF6:
Terra(confirmed)
Kefka

FF7:
Cloud(confirmed)
Sephiroth

FF8:
Squall
Ultimecia

FF9:
Zidane
Kuja

FF10:
Tidus
Jecht

FF11:
Shantotto

FF11 has been confirmed
We might get FF12 next

I think they need to add some minor (yet famous/popular) characters from the games as hidden characters. Someone like Black Mage, Vincent, Red XIII, Auron, maybe a jouster that rides on a Chocobo maybe?

A summoner would be pretty cool also, maybe Yuna? Tifa would be cool also because she would probably be the only one that doesn't fight with a weapon.

Hmm i thought Tidus and Jecht were confirmed since they are in the character trailer

i just wanna use sephiroth and jecht, if i can use them im happy, lol

it only matters if kuja and kefka is on there, a duel between them would be so awesome. who would win i wonder..^^

The final chars has been confirmed

Bartz
ExDeath
Terra
Cloud

FF7:
Cloud(confirmed)
Sephiroth

always happy to see them <3 i can't wait for this game

Let's just hope they add 10 more characters in the roster...
I mean, "The more the merrier" right?...

I wouldn't mind knight class of ff tactics so I could do things like power break, magic break, armor break, etc

I think they will only be adding one more character to the list (Someone from 12, most likely a villian, since the character from 11 is on cosmos' side and I've read that they don't plan on having a villian from 11). Besides, Vaan would be a pretty lame character to fight as don't you think. And they are definitely not adding a character from 13 because they were afraid that having a character in Dissidia would screw up 13.

no thats not the reason why they cant add 13
cuz they dont really know how to portray Lighting and the umd space was getting limited

I read in an interview that Nomura DID want to include a FFXIII character, but he didn't want to give people an idea about the character's skills and/or fighting style.

I hope they put most of the characters in it not all but most I would buy this game. This is the only game I'm looking forward on playing.

I don't think there's any FF13 characters, yet anyway, since this game is less than a week old.
BTW, Gabranth is the FF12 character here. (someone posted in gamefaqs, I haven't unlocked him myself)