Sara Altney

Lady Sara Altney is the Princess of Sasune from Final Fantasy III who becomes the player's first extra-party member. While she may be a princess, she is more than capable of taking care of herself.

Story
She joins the party after the party goes to the Sealed Cave to look for her, in order to use her Mythril Ring to banish the Djinn's curse. Since she wasn't in the area at the time, she was unaffected by the curse. After the Djinn is killed, she throws her ring into the spring in the castle basement, dispelling the curse.

Whenever the party meets Sara, she seems to show interest in Ingus. While he has sworn to protect her, he too also shows interest in her. When Doga asks Sara to help break the Dragon's curse, she joins him once she finds out Ingus is in trouble. After breaking the curse, she stays behind with the others while the party enters the Dark World.

When the Cloud of Darkness is defeated, Sara decides to stay with Ingus for a while, before returning to the castle.

Abilities
In the Nintendo DS version of the game, she aids the party by casting Cure on its members and Aero against monsters. As Cure and Aero are both White Magic spells, it's likely that Lady Sara is supposed to be a White Mage character, like Aria.