Final Fantasy X
In Final Fantasy X, Tidus is introduced in medias res via an in-game cut scene showcasing the main characters around a campfire back dropped by the wreckage of a city, Zanarkand. He narrates most of the game events, revealing his thoughts on certain aspects of his journey. Tidus recounts how events have led to the present, starting at his life in Zanarkand where he was a sports celebrity in Blitzball, a fictional sport that combines elements of hockey, soccer, and water polo. During a Blitzball tournament, Zanarkand is attacked by an immense creature shrouded in water known as Sin. The city is destroyed in its path, and Tidus is taken by Sin to the world Spira.
After arriving in Spira, Tidus encounters an eccentric salvager race, the Al Bhed, and learns from a young Al Bhed girl named Rikku that 1000 years have passed since the destruction of Zanarkand. After another attack by Sin, Tidus is separated from the Al Bhed and drifts to the island Besaid. While on the island he meets Yuna, a summoner who is planning a pilgrimage to destroy Sin, along with her guardians: Lulu, Wakka and Kimahri. Tidus navigates his way throughout Spira in the hope of finding his way home. On the way, he meets a friend of his father named Auron, who further reveals to Tidus that Yuna's father, Lord Braska, Tidus's father, Jecht, and Auron himself made the same pilgrimage and defeated Sin ten years ago. However, Sin is reincarnated every time it is destroyed, and the current Sin is Jecht. As the party approaches Zanarkand, Tidus learns he is not an ordinary human being. He and the Zanarkand he hails from, are the cumulative dreams of the fayth. Their city, Dream Zanarkand, was created at the same time as the destruction of the original Zanarkand, when Sin was created in the war between Zanarkand and Bevelle. The fayth of the aeon Bahamut reveals to Tidus that they would like him to find a means to permanently defeat Sin, so that they can all finally rest. However, the fayth also reveals to him that if he does that, the summoning of Dream Zanarkand and all its people—including Tidus—will disappear.
Tidus reaches Zanarkand's ruins with Yuna and her other guardians. Inside Zanarkand, they learn from Lady Yunalesca that Yuna must choose one of her guardians to become her fayth for the Final Summoning. Tidus argues with the others that they must find another way to destroy Sin forever. Yuna refuses to undergo the rite of the Final Aeon after learning that it can never defeat Sin, and the party fights and defeats Yunalesca. The group then attacks Sin directly and enter its shell. Eventually, they find Jecht and Tidus is reunited with his estranged father, who transforms into his Final Aeon form and is defeated by the party. The party engages the corrupt deity Yu Yevon in a final battle and destroys him, ridding the world of Sin permanently, as well as allowing the fayth to depart and the summoning of Dream Zanarkand to end. Tidus says goodbye on top of their airship and starts to walk away knowing that he will soon vanish. Yuna runs after him and, tells him that she loves him (in the Japanese version of the game, she says "Thank you" instead). Tidus hugs her and then dives off the airship into the clouds below, reuniting with the spirits of Auron, Jecht, and Braska in the Farplane.
Final Fantasy X-2
Tidus figures prominently into the plot of Final Fantasy X-2, though his appearances in the sequel are few. Also, because players have the option of renaming Tidus in Final Fantasy X, he is exclusively referred to with pronouns ("he" and "him") just like in the first game, and Rikku calls him "you-know-who" in Final Fantasy X-2. Two years after the events of Final Fantasy X end, Rikku shows Yuna a sphere found by Kimahri on Mt. Gagazet displaying a young man who looks like Tidus trapped in a prison. This compels Yuna to join the Gullwings, a sphere-hunting group, and travel around Spira in the hopes of finding more clues that Tidus may be alive. The individual seen in the sphere is eventually revealed to be Shuyin instead, but if the player presses the "X" button during the final scene in the Farplane, the player will be rewarded with an extra scene that features Tidus being revived by the fayth in gratitude of Yuna saving the world a second time. He is then reunited with her (the "swimming upwards" clip from the ending of the previous game is shown, and it is shown that he has been returned to Besaid) and allowed to live out a natural lifespan, so long as the Fayth can maintain it. In the ending, Yuna also begins narrating the events of the game to Tidus. If the player can manage to complete the game with 100% completion rate (doing not only the main storyline missions, but many other optional tasks), there is another final scene with Tidus and Yuna, at the Zanarkand ruins, in which he reveals the nature of his return.
