Not to steal Shoryu's thunder, because he's a great writer from what I've seen, but I have some interest in this as well.

Mainly have interest in playing FF:Tactics Advance1/2 characters. I'm thinking Marche being on the side of Chaos. (Because he's often portrayed as the antagonist in many people's opinion) and Ritz being on the side of Cosmos. One could say Queen Remedi/Li-Grim should be included, but that character is "meh" at best as the Final Boss. And I'd choose Mewt over Ritz for Cosmos; But Mewt is weaker than an unequipped Spoony Bard, and Ritz is a cooler character anyway. Not to mention actually competent. 

Alternatively, for Advanced 2, Luso for Cosmos and Illua for Chaos.

I'm pretty busy most of the time, but I try to slip one reply in a day. I'm not super-familiar with PvP, so I might need to get corrected if I over-step my bounds, but I'm happy to learn from my mistakes. I suggest, regardless of you accepting me or not, that you perhaps take Shoryu as well; Because, as I said, he's a great writer.

For now, I sleep. I'll reply back as soon as possible.