For anyone who has things to add to the game.

I'm thinking we keep the party at four, to make it simple, and have multiple classes for each character. As in, Sambo could be a black mage, summoner-type character, a Blue mage (uses enemy skills), or any of the associated classes. Leon could lean towards a heavier fighting style versus a lighter one, and our main character could have different ones as well that dictate his weapon usage. As for Harmony, I'm not sure yet. But these are just ideas.

(damn you 1000 chars limit)
-Using all of your allies in combat: Ever wondered why you could only use 3 or 4 of your allies in a fight when you have 8 or 9 of them following you at all times? The idea is to solve this issue, either with a party composed of only 4 people or, if there are more than 4 allies, an ingame system and reason for not having them all at the same time. Maybe healing is less powerfull (than it is usually depicted) or healing magic enables your chars to keep on fighting, but doesn´t close the wounds completely, or perhaps there are unwanted side-effects to healing magic abuse. After all, chugging down 20 potions at once can´t be good for you, right? Maybe implement a recovery/healing/rest time system so that the player has to cycle through the chars, leaving some to rest/as a reserve.

Two ideas that came up:
-World exploration: Instead of having a vague overworld with detailed points of interest, create a large world composed of many maps, which could be explored with skills like Jumping, Climbing and Running (Parkour), Swimming/Surfing, and Flying. Also, make it so that the player can use these skills when exploring towns, cities, etc.

(to be continued in another comment)