The Famicom version of this game had four unnamed onion knights as the protagonists. In this version, they were given names and backstories, and there is one female in place of a male. The list of characters in this game are as follows:
Refia is the only female character in your party. She is the adopted daughter of a blacksmith in Kazus town, but runs away from home because she doesn't wish to follow in her 'father's' footsteps. She is strong-willed, and for some time unable to enter the village of Kazus.
Ingus is a loyal knight of Castle Sasune, ruled by King Sasune. He is the faithful servant of the princess Lady Sara. He, like Refia, escapes the curse that befalls the castle by not being there at the time of casting.
Cid, as keeping in tradition with the Cids from various games of the Final Fantasy series, owns an airship. It is from Cid that you acquire an airship.