Final Fantasy X is the first game in the franchise to feature full voice acting. However, as in its predecessors, the player is allowed to change the main character's name at the start of the game. For this reason, Tidus is never referred to by name by any of the other characters.
The majority of the English dialogue was not based to the actual game footage; the only guidance the voice actors had were samples of the original Japanese dialogue, and they rarely had the opportunity to sync their dialogue with actual footage. Once the voice recording was complete, sound editors would digitally speed up or slow down the audio clips in order to fill the character's allotted speaking time for each particular line.
When the party arrives at the city of Luca, the music playing in the background is "Brahne Appears - The Play Begins", which was the opening theme to the play "I Want to Be Your Canary" performed by Zidane's group Tantalus in Final Fantasy IX.
The lyrics to the Hymn of the Fayth ("Ieyui, Nobomeno / Renmiri, Yojuyogo / Hasatekanae / Kutamae") are made up of Japanese syllables that, when deciphered, translate in English to "Pray to Yu Yevon / Dream, Fayth / Forever and ever / Grant us prosperity".
During the English voice casting process, it was originally proposed that Tidus and Yuna were to be voiced by known celebrities and were actually cast with two celebrity voice actors; however, it was decided that the story and characters should be a priority so the idea was dropped.
Lulu uses dolls as weapons throughout the game. The dolls are based on characters from other games in the Final Fantasy series; Lulu's starting weapon is the only appearance of the regularly featured 'moogle' characters, and her most advanced weapon is a rendition of the interchangeable Onion Knights from Final Fantasy III, which was unreleased in America until 2006.
Character designer Tetsuya Nomura has identified the South Pacific, Thailand and Japan as major influences on the cultural and geographic design of Spira, particularly concerning the geographic location of the southern islands; Besaid and Kilika.
Sub-character chief designer Fumi Nakashima's focus was to ensure that characters from different regions and cultures bore distinctive characteristics in their clothing styles, so that they could be quickly and easily identified as members of their respective sub-groups. For example, she has said that the masks and goggles of the Al Bhed give the group a "strange and eccentric" appearance, while the attire of the Ronso lend to them being able to easily engage in battle.
Development for Final Fantasy X began in 1999, costing approximately four billion Japanese yen (approximately 32.3 million in the US) with a crew of more than 100 people, most of whom worked on previous games in the series.
Producer Yoshinori Kitase felt that if the setting went back to a medieval European fantasy, it would not seem to help the development team advance. While he was thinking of different world environments, scenario writer Kazushige Nojima suggested a fantasy world that incorporated Asian elements.
This is the second instance in a Final Fantasy game where the recurring character of Cid is directly related to at least one of the playable characters. In this game, Cid is Rikku's father and Yuna's uncle. The first game to have such an instance of direct relation to Cid was _Fainaru fantasy IX (2000) Still, Yuna and Rikku are related to Cid by blood unlike the respective character in Final Fantasy IX (VG)_.
Paula Tiso commented that voicing Lulu was different from the work she usually got. She was used to voicing perky and bubbly women in commercials, making it quite a change to play the cynical and withdrawn Lulu. It was also one of her first major roles in voicing a video game character.
Japanese and Western critics have generally given Final Fantasy X high review scores. The Japanese video game magazine Famitsu and Famitsu PS2 awarded the game a near-perfect 39/40 score, and readers of the former magazine voted it the best game of all time in early 2006. Another Japanese gaming magazine called The Play Station gave the game a score of 29/30. Famitsu, Famitsu PS2, and The Play Station expressed particularly favorable responses toward the game's storyline, graphics, and movies.
As Tidus's name is never spoken aloud during the game, the correct way to pronounce it has been a constant debate among fans. In an interview promoting the game, his voice actor James Arnold Taylor pronounced it "tee-dus". In a scene in Kingdom Hearts II, Selphie pronounces it "tye-dus". According to the developers, the former is the correct way.