!X (or si!Xist-i!xalt-iVa!qara) was one of the People.
He was one of the Truly Crazed on the Worldsphere, the term used by the People for their mentally ill. When Bernice Summerfield met him and his psychologist Fos!ca on Tyler's Folly, !X was the only Truly Crazed left, as the others had been cured through indifference. After their adventures on Tyler's Folly, !X and Fos!ca returned to the Worldsphere. (PROSE: Down)