MALEVON'S PROFILE

I suspect you'll double your goal when the english translation is done, anyway congratulations!

you could also add passives that have a chance to trigger effects to those physical characters (a small chance to stun for example)

what about giving materia some small stat boosts and make them enchance one skill/spell, that way everyone can equip any materia but you get the best results if you equip materia on people who have the respective skill
ex: Steal Materia increases Speed by 3% and allows Cid to use Steal twice on the same target

or

only implement materia that works like the purple materia (elemental, all...) that way you will have only a fiew new elements so as to not confuse people with too much stuff but also make materia important on a tactical level
ex: Elemental Materia makes normal attacks deal elemental damage based of who uses it (Wedge deals fire damage)