I really feel like the material system could use some change. for example square should add material slots to the unique gear that you buy using law,poetics and things like that. anyways you should have 3 types of materia one for each(Weapons, Armor, and Jewelry) the materia we have now should be change to armor and Jewelry materia to raise stats. Weapon materia should focus on skills for example you could have a Materia that adds various effects to skills(adds a 10% of slowing the target) or even extend the duration of others(increase the duration of bloodbath by 15 Sc). kinda like a glyph system in some mmo were it slightly changes a skill but does not cause a huge impact is a great way to add variation.Or you could go as far as even adding skills Ex(First aid:Restores a small amount of Health)Something very smalls that doesn't break the game.add more materia with more effects like increase the gill you earn from battle, increase potion potency.