I'm about 7 hours into the game and HOLY MOLEY does this game have a ton of systems. Let's see there's...
Bonus XP (Used at Inns)
Regular XP
Weapon XP
Special XP
Arts for your Blades
Passives for your Blades
Field Skills for your Blades
Arts for your Drivers
Passives for your Drivers
Equipment for your Blades
Equipment for your Drivers
Temporary Food Buffs for each character
Prefered food/items for gaining affinity with each character
Gather points
Diving points
Weapon Upgrades
At least 30 different Blades
An element type for each Blade
A unique robot Blade that you upgrade like a custom PC
A special arcade game that you play to unlock robot upgrade parts
Canceled Attacks
Break, Topple, Launch, Smash combos (I haven't figured this out yet)
Element combos (this either)
Regular tutorials
Shopkeeper buyable tutorials
Town upgrades
Buyable shops
A huge and ridiculously detailed fast travel system
This is the most complicated game I've played since freakin MorrowWind. It's like they tried their damnedest to cover everything with a unique system of some sort. I'm lost as hell right now, but loving it.