Kiersta is a Ronso with a love for the sea. As a result of her love for the warmer parts of Spira, Kiersta ended up an outcast amongst Ronso, who prided themselves on their home in the mountains.

Kiersta is an active mariner and works on a fishing vessel in the warmer waters of Spira near Besaid and Kilika. Unlike most Ronso, Kiersta is a good swimmer and experienced with sea travel. As her fur coat is still adapted for the icy conditions of Mount Gagazet, her choice of attire is suitable for the hotter climate.

In battle, Kiersta attacks from the rear line using her fishing harpoon which she can throw, then draw back to her with the attached rope. She otherwise has average stats and can fill a variety of roles.

Her experience with sea travel one day gets her caught up in an adventure paralleling the events of FFX, which involves the rediscovery of Leviathan, an Aeon whose temple was lost to the sea centuries ago...