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- "He is the one who sowed the seeds of hatred. He is to blame. But I am at fault for letting him become what he was."
- —Seymour's mother in Baaj
Seymour's mother (シーモアの母, Shīmoa no Haha?) is a non-player character in Final Fantasy X. She appears to the party to tell them the history behind Seymour Guado. Seymour's mother is voiced by Hedy Burress, who also provides the voice of Yuna.
Seymour's mother was a woman with shoulder length dark hair, which was lightly threaded with gray, showing that although she still looked like a young woman, she was possibly older. It's also likely the gray hair was a result of her careworn existence, hated by humans, reviled by the Guado. She has blue eyes, which Seymour inherited, and is dressed in a dark purplish-blue draped bodice with a simple straight blue skirt, and a delicate golden chain belt with small teardrop pendants hanging from it. Her dress is very reminiscent of simple Grecian styles. She wears strapped blue-gray heels and split tiered green sleeves edged with pale yellow and a orange chain-link pattern at the top, as well as an elaborate golden necklace.
Seymour's mother, who remains nameless throughout the game, is found at the Baaj Temple as the fayth of the aeon Anima. She reveals that in her past life, she was the object of much animosity due her interracial marriage to Lord Jyscal Guado, and to prevent civil war among the Guado she was exiled with her young son, Seymour Guado, to Baaj Island for their own protection. When Seymour demonstrated exceptional talent in the art of summoning, his mother encouraged him to undertake the pilgrimage to Zanarkand and volunteered to serve as his guardian along the way.
When they reached the Zanarkand Ruins, Seymour's mother offered herself up to be turned into the fayth for the Final Summoning; Seymour, however, devastated by the thought of her death, broke off the pilgrimage and fled into the wilderness. Seymour would not return for his mother's fayth until he was twenty five. Having finalized his plans, he then moved her fayth statue from Zanarkand and sealed it within Baaj Temple.
When Yuna and her guardians visit the ruins of Baaj Temple in the game, they are greeted by Seymour's mother's fayth, who tells the story of Seymour's past and offers Anima's services to Yuna to help her destroy Sin. She reveals that she holds no ill will towards her son; rather, she blames herself for failing to sufficiently prepare him for the challenges and pressures that would face him as a summoner and a half-human living among the Guado. Having always felt responsible for Seymour's downfall, she views her service to Yuna as her last opportunity to atone for her decisions, to stop Seymour's "obsession with Sin", and welcomes the chance to be possessed by Yu Yevon in the final battle.
During the final battle with Seymour inside of Sin, if Anima is summoned Seymour remarks "You would oppose me as well? So be it!" It is unknown though if Seymour is addressing Anima as a former aeon, or as his mother.