[@Raddum]
Basically in agreement. Just a few additional comments on my end.

[quote=Raddum]
All that Zidane knows is he was told he was fated to destroy 'Terra'. He doesn't know that Terra is actually a planet from his own world, rather than the woman of the conveniently same name on the opposite side of this current conflict. Once he actually meets Terra he'll question himself, and become uncertain of why he's actually supposed to do it.[/quote]
I don't want to create a hole in this idea, but there's something we definitely need to discuss. To the best of my knowledge, Zidane's home (where he was created) planet is called 'Terra', while the one Garland told him he's destined to destroy (the one where he grew up) is actually called 'Gaia'. We might need to rework his memories slightly, and this is one of the reasons I asked for what he knew.

[quote=Raddum]
I felt sort of at home putting Zidane on Chaos not just because of the ideas I have for him, but also because him and Freya were friends before the rest of the cast; And she's one of the most likely characters to be able to kick his ass for what he's doing.[/quote]
Outside of Zidane's true power as the 'Angel of Death', Freya could be a solid opponent for him, but without significant power boost over the course of this cycle I doubt any of Zidane's party would be a match for him since he's, in theory, more powerful than Kuja once fully matured and even with the present Zidane on their side the party [i]never[/i] actually manages to beat Kuja -- both boss fights with Kuja are scripted battles where he wipes them out with Ultima after a skirmish.

[quote=Raddum]
All-in-all, it might just be a good idea to leave him out of this cycle. It brings a sort of irony; Kuja always sees himself as 'superior' to Zidane, but Zidane is chosen by Chaos as a Warrior instead. It might just be to spice things up with the lineups, but still a little something to use as an excuse, possibly. 
[/quote]
Considering Zidane was actually [i]created[/i] to be a replacement for Kuja, it's [i]painfully[/i] ironic; however, that almost makes me want to play with it even more if I can come up with an idea. I won't force myself to since you've got Freya counterbalancing Zidane, but I'll consider it.