Kingdom Terrahearts/Mechanics

Active Mechanics
Party members: If you press the F key, you can assign which town npc you want as your party member (if this does not work, enter settings, controls, keybindings, scroll down and look for Party Menu).

Keyblade Mechanics
Combos: Much like combos in other games, attacking with the weapon shortly after another attack will change the attack itself, being just a diferent way of swinging it or casting magic.The combo starts with a normal swing of the weapon, then a stab, a magic spell (that depends on the keyblade used), another stab, two attacks that depend on the type of keyblade used and finally a swing (you can only get a combo of up to 4 moves).

Pasive Mechanics
Kupo coin: while holding this item, you will not die, you will instead recover half your health and the item will be consumed. This can only happen every 3 minutes unless you die.