is a fictional 15 year-old character in the Final Fantasy series, and a protagonist in both Final Fantasy X and X-2.
Rikku was designed by Tetsuya Nomura, who also designed other characters from Final Fantasy X and X-2. She is voiced by Tara Strong and Marika Matsumoto in the English and Japanese versions respectively. Rikku's outfit changed from a casual outfit to a skimpier outfit (most notably a visible bra and thong) from Final Fantasy X to X-2. Tetsu Tsukamoto, the alternate costume designer, explains that the change could come from the changes in Spira from the two titles from a "darker, religious feel". The decision to pick Rikku as one of the three female leads came early on in the design process of X-2, due to the developers challenging themselves to create an all-female character party. Yuna and Rikku were the original choices, while a third original character was created to complete the trio. It was rumoured that Square Enix planned to have two sequels to Final Fantasy X - one starring Yuna and one starring Rikku. However, the developers later elaborated that there would be no such "Rikku Version", and it was just a rumour that arose during development.
Rikku is a 15 year-old Al Bhed who helps Tidus when he first arrives in Spira, but then disappears from the story for a while, becoming the last character to join Yuna's entourage of guardians. She is bilingual, able to speak both English and Al Bhed fluently. Rikku's character class is most similar to that of the Thief from earlier Final Fantasy titles, combined with the Chemist class. She can steal a large variety of items from fiends and bosses alike, many of which can only be acquired through theft. She also is able to dismantle Machina with her theft command. The ability to customize becomes unlocked only after Rikku permanently joins the party. Her attitude is somewhat childish, but is also quite cheerful and positive. Rikku is also highly intelligent, being bilingual and skilled in chemistry. An Al Bhed, she is also Yuna's cousin and loves her dearly, and, as such, wishes to prevent her from going through with her pilgrimage, becoming particularly insistent as the party climbs Mount Gagazet toward Zanarkand. She is also the one who informs Tidus that Yuna would die if she summoned her Final Aeon. In battle, Rikku uses a variety of claw-like weapons. After the Calm, Rikku visited Yuna at Besaid often before the events of X-2. Rikku returns in Final Fantasy X-2 as a main protagonist, now seventeen years old and prominently featured as a Thief. She was also the one who convinced Yuna to leave Besaid on a journey after showing her a mysterious sphere featuring a familiar person.
Rikku also appears in Kingdom Hearts II as a miniature fairy version of herself wearing modified versions of her Final Fantasy X-2 attire. Her name is never spoken aloud in order to avoid confusion with a major male character called Riku. Much like her Final Fantasy X-2 self, Rikku is a bit ditzy and good-natured as well as a treasure fanatic like her teammates. Itadaki Street Special features a miniature Rikku in her Final Fantasy X-2 outfit, along with Yuna and Paine.
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Official Site: Square-Enix
Links: Rikku Wikipedia page Square: Rikku FF Wiki: Rikku