Rikku is a lively and kind-hearted Al Bhed girl who is a playable character in both Final Fantasy X and its direct sequel Final Fantasy X-2.
Rikku's father, Cid, is the leader of the Al Bhed, and she has a brother who is aptly named Brother. Her mother died before the events of Final Fantasy X, having been killed by a faulty machina. Cid's sister married High Summoner Braska, Yuna's father, and so Rikku and Brother are Yuna's biological maternal cousins.
Because of their bond being cousins, Rikku is completely loyal to Yuna – whom she affectionately calls 'Yunie' – and the most vocal opponent to her ongoing pilgrimage that will eventually claim her life. Over the course of the game, she also forms a close bond with Tidus and looks up to him as a brother (and treats him rather better than her own), perhaps because of their similar personalities and devotion to Yuna; their friendship is so close that Tidus is the first one of Yuna's guardians to whom Rikku reveals that she and ]Yuna are biologically related. She also turns to him for comfort, as seen in the Thunder Plains, when she collapses on the ground with fright, crawls directly towards him, and grabs him by the leg.
Personality-wise, Rikku is kind-hearted, very spirited and energetic, which sometimes clashes with the more stoic group members. She looks up to Lulu as something of a role model, being impressed with her calm levelheaded-ness – Tidus and Kimahri would share their views on this, the former saying that Rikku should work hard to become like Lulu, and the latter saying that "Rikku should stay Rikku". Child-like and playful in many ways, Rikku tries to maintain a positive outlook and often refers to gloomy or annoying people as "big meanies". Her cheerful outlook often makes a stark contrast when she is sad or upset. She also suffers from astraphobia after a mishap involving Brother and a Thunder-spell in her youth, although she starts to deal with this in the first game, and has overcome it in the second game, explained in the first visit to the Thunder Plains when Yuna narrates that Rikku overcame her fear by camping out in the Thunder Plains for a week; however, she also reveals a fear of snakes in Final Fantasy X-2, completely freaking out when confronting snake-like enemies, and sometimes shouting "Snake! Snake! Snaaake!" when entering battle against a snake like enemy such as a Recoil. By the game's end, she wonders about her own life, but is reassured by Yuna that her own adventure will arrive one day.