Final Fantasy III has a more "economic" cast, much like the other Famicom games. The cast of characters can be split into three types:
The main characters of the game. The original Famicom version stars a party of four identical Onion Knights. The 3D Remake retools them into four distinct characters: Luneth, Arc, Refia and Ingus.
People who travel with the Warriors of Light. In the Famicom and Pixel Remaster versions, they mainly accompany them and can be talked to. In the remake, they randomly appear to assist the WoLs during gameplay.
The baddies who cause trouble throughout the world. Xande is the main antagonist, but he is far from the only one. This list only includes the notable antagonists (sorry Giant Rat fans).