Yuna is the deuteragonist of Final Fantasy X and the main protagonist of its sequel, Final Fantasy X-2. She is the daughter of High Summoner Braska and an unnamed Al Bhed woman, who died when Sin attacked her ship at sea. Yuna's mother was the sister of the Al Bhed leader Cid, who is Yuna's uncle and the father of Rikku and Brother, Yuna's cousins.

In Final Fantasy X, Yuna becomes a summoner like her father before her, and embarks on a pilgrimage to expel Sin. She meets Tidus who teaches her there is more to life than sacrifice.Yuna is a kind-hearted, loyal, honest, and polite humanitarian who strives to see the best in others and has a strong conviction to complete whatever task she feels is her duty. She is naive, always believing the best of people, and often places the needs of others above her own. Like most summoners, Yuna is a devout follower of Yevon's teachings. She hides her feelings of fear and sadness while encouraging her friends to express themselves in her place.

Two years later Yuna has undergone a transformation with a new revealing dress style and a more adventurous personality. Yuna's attire changes for each of the dresspheres, with details that distinguish her from Rikku and Paine. Yuna's default appearance is the Gunner dressphere, an outfit given to her by Rikku in Final Fantasy X: Eternal Calm. Freed from her responsibilities as a summoner, Yuna has a new lease on life. Though still unflinchingly polite, soft-spoken, and driven, she is now athletic, cosmopolitan, outspoken, and playful. Yuna has developed a go-getter attitude, willing to jump headfirst into danger but also considers to resolve issues without resorting to violence. She has learned to think and desire for herself.

Yuna has heterochromia: her left eye is blue, while the right is green to represent her half-Al Bhed heritage, though without the characteristic spiral. (More...)

Concept art of Bhunivelze for Lightning Returns: Final Fantasy XIII. According to the Fabula Nova Crystallis: Final Fantasy mythos, Bhunivelze killed his mother Mwynn to seize control of the mortal world for himself. However, this act sent Mwynn to the Unseen Realm and created what Bhunivelze saw as the curse of death. To find the Unseen Realm and take control of it as well, Bhunivelze created Pulse and Etro to find the gate to the Unseen Realm. Distraught when he realized Etro had been created in the image of Mwynn, he gave her no powers and created Lindzei to serve in her place. With his children working, Bhunivelze entered a deep sleep to wait until they found the gate to the Unseen Realm.

In Lightning Returns, the death of Etro releases chaos over the world and merges Valhalla with the mortal world, awakening Bhunivelze. The deity plans to create a new world with the old one on the brink of destruction, and tasks Lightning to save the souls of humanity and guide them to the new world for him.