Seymour is actually half-Guado and half-human, as his father married a human woman, whose name goes unmentioned and is the fayth for the Aeon Anima, in an attempt to foster friendship between the Guado and human races. However, compared to Yuna, who is cared and loved by those who knew her in spite of her half Al-Bhed ancestry, Seymour was regarded as an abomination as Jyscal's decision to wed a human led to disunity in the Guado tribe. To avoid further strife amongst the Guado nation, Jyscal had his wife and son exiled to the island of Baaj. Afterwards, Seymour's mother – suffering from a terminal illness – gave her life in the Baaj Temple to become a fayth, believing that only in sacrificing herself for Spira's temporary peace (known as "the Calm") against the malevolent creature Sin would her son be accepted by the people. Horrified, Seymour refused the aeon and returned to Baaj, where he dwelled alone for years, becoming increasingly morose and cynical. In time, he came to believe that death was the only freedom from the suffering of life, and that it would be in everyone's best interests to die and thus developed a Messianic complex. But to achieve his aims, he had to have a power greater than Anima, whose power he eventually accepted, over even all the aeons combined.
Thanks to Wikipedia for informations about Auron.
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