My Question is "One Overdrive". Is that per battle? And can the aeons use their Overdrive? I wonder because it would conflict with the "Meatshield" rule.

I am fine with setting up the party by voting. I am also fine with the "No Escape" and "No No Encounters", since I don't use them anyway. I was never good at customizing Equipment to begin with.

How difficult is it to complete the game with no stat increases? I mean, Sin is a powerhouse with its attacks, especially later on.