Final Fantasy Innovations

[vdogmrjacob]

Final Fantasy (and consequently, Square-Enix) is known for innovating the RPG genre. Between battle systems, magic systems, and equipment systems, FF has taken many leaps and strides to find an overall excellent game system. I liked FFX, with it's new leveling grid, weapons and armor abilities, and CTB.

So, first question: which FF game (can be any, but I'd like to limit it to the main roman numeraled games), in your opinion, had the best system innovations? And was this game better because of those innovations?

Second question: what kind of new and original (please do not cite systems already used by mainstream FF) systems would you like to see in an RPG/FF?