Seymour Guado (Japanese: シーモア＝グアド, Hepburn: Shīmoa-Guado) is a fictional video game character in Square Enix's Final Fantasy series who appears as a major antagonist and temporarily playable character in the 2001 role-playing video game Final Fantasy X. Seymour is a 28-year-old mage and priest of the fictional religion of Yevon.

He frequently ranks as one of the most memorable antagonists in the Final Fantasy series due to his nihilistic personality and his unwillingness to accept defeat.

[2][10] During the development of Final Fantasy X, it was proposed that characters grow stronger through a "tattoo system" where the player would have leveled up by placing tattoes on a grid.

He first auditioned to play the roles of Tidus and Jecht, later trying to read Auron's lines before finding Seymour's dialogue in his additional materials.

The match is interrupted when the stadium is swarmed by monsters Seymour secretly unleashed, only so that he could eliminate them using Anima in a staged show of strength.

Realizing that he can no longer achieve his goals by gaining Yuna's trust, Seymour instead chooses to enact his plans by force, and attempts to kill her party.

Gagazet, Seymour makes a last-ditch effort to prevent Yuna from reaching Zanarkand without him, killing numerous members of the Ronso tribe and using their spirits to transform once again, only for him to be defeated a third time.

[15] In the Final Fantasy X-2 International edition of the game, additional side content gives the player the option to battle Seymour and recruit him as a playable character.

[21][22] Engadget praised that the character was "created to be resented," making it more satisfying to defeat him, commenting that he inspired a "near-instant hatred" which "only deepened with each of his appearances.

[24] The entertainment website Việt Giải Tri wrote that his character design communicates to the player that Seymour is an antagonist before the game's story makes this clear.

[26] Seymour was compared favorably to other antagonists in Final Fantasy X by the IDN Times, which argued that the large amount of screentime he received throughout the main storyline made him a more memorable character.

"[32] In the 2009 thesis Final Fantasy X and Video Game Narrative: Re-Imagining the Quest Story, literary scholar Mark Host writes "Seymour is interesting in that he is the antithesis of Tidus, and more than a mere obstacle to the party."

[33] In his Meaning and emotion in Squaresoft's Final Fantasy X: Re-theorising realism and identification in video games, media studies lecturer Glen Spoors argues that the "constant re-typing of Seymour is central to FFX's hermeneutics", noting that his perception by the player evolves from "romantic competitor" and "young leader" to "politician" and "treacherous tyrant", "patricidal" and "genocidal lunatic", to eventually "psychologically disturbed."