Lulu is a twenty-two year old mage and one of Yuna's guardians. Her basic physical attacks are weak initially, but she is the only character (other than Kimahri) to be able to use Black Magic at that stage of the game. Lulu sends dolls — including cactuars, moogles, and other Final Fantasy creature types — to attack enemies by proxy. Lulu's Celestial Weapon is the Onion Knight, a homage to Final Fantasy III. Her Overdrive attack is called "Fury," and enables her to repeatedly cast any Black Magic spell she has learned without using any MP. The quantity of castings are dependent on the strength of the spell and how fast the player rotates the right analog stick on the PlayStation 2 DualShock controller.
Born on the island of Besaid, where she grew up with Wakka, Yuna, and Wakka's younger brother, Chappu, Lulu is often stern and scathing (particularly to Wakka). However, she is nonetheless caring toward others. She is also highly intelligent, and is one of the few Yevonites who easily questions the Yevon religion on objective terms. She is well endowed, and is often compared to Tifa Lockhart in this regard. Before becoming a guardian to Yuna, Lulu guarded two previous summoners whose pilgrimages abruptly ended prematurely. Her second pilgramage, that of Father Zuke, ended in the Calm Lands (a common decision among summoners). The pilgrimage of the first summoner Lulu guarded, Lady Ginnem, was cut short by her death in the Cavern of the Stolen Fayth. This event still troubles Lulu's memories, but when Yuna and company detour to the valley where the cave is located, Lulu decides to face her painful memories. At the back of the cave, the group meets the unsent bodily shell of Lady Ginnem. Lulu felt that she must fulfill a last duty to Ginnem as a guardian in ensuring that her spirit would depart to rest peacefully on the Farplane. After fighting and defeating Yojimbo — the aeon having been summoned by Ginnem — Ginnem's spirit departs for the Farplane. Lulu had been romantically involved with Wakka's younger brother, Chappu, and his death at the hands of Sin affected Lulu greatly. However, Wakka and Lulu fall in love and marry six months after Final Fantasy X. In Final Fantasy X-2, Lulu gives birth to Wakka's child, "Vidina".