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According to his character page on the official Tekken website, Miguel is depicted as an undisciplined Spaniard with a passion for fighting, which often brought him into conflict with his parents, causing him to leave home at age fifteen.

Despite his negative side, Miguel is shown to be capable of love, especially in the case of his sister, whom he cares for more than anything in the entire world. His sister would visit him often behind their parents' back to make him happy, until one day when she informs him of her impending marriage. Miguel is baffled at the news and considers killing his future brother-in-law, but decides against it in order to avoid breaking his sister's heart.

On the wedding day, Miguel watches the ceremony with regret from outside the church, until it is unexpectedly attacked by a fleet of planes and blown to smithereens before Miguel's eyes. Miguel searches for his sister, only to find her blood-drenched corpse.

Miguel's investigations lead him to realise that the attack was ordered by the Mishima Zaibatsu, and driven by anger, he enters the recently announced King of Iron Fist Tournament 6 to exact revenge on the Zaibatsu's CEO, Jin Kazama.