Okay here is the concept of FFD in a nutshell. One hero and one villian, mostly ( ONLY ) Main characters and main baddies. Are all drawn together over these weird power crystals, the good guys are tryin to protect these crystals the bads are trying to take them for more power yada yada typical Bad guy stuff.
The main heroes of FF 1- 6 and the main villians are already confirmed. In FF7 Sephiroth is a definite ( he's already in the offical preview. ) But no hero from 7 is present. From FF8 we have Squall ( or Leon for Kingdom Hearts fans.) And the witch who controls time I foregot her name. In 9 We have the main Good vs the main Bad. And in 10 TIDUS and Jecht YAY!!!! ( Although Auron would have been badass. ) You can look up the offical trailer on youtube if U like Sephiroth is the very first badguy they show and of course he's walking through fire.
Now On FF7 since it has to be a MAIN person it'll be either: Reno, Zack, Cloud, or Vincent they're main playable people in that oreder in the FF7 sereies soooooo out of those who do you think? Man that was a long reply LOL.
I don't wanna be a legend, well thats a god damned lie I DO.