Mario Incandenza is the youngest child of Avril Incandenza (née Mondragon). Mario passes his days at the Enfield Tennis Academy, where he makes films after the style of his late father, the highly esteemed Dr. James O. Incandenza.
Mario is not a student at ETA on account of his being unable to play tennis and his choosing not to read. Mario is perfectly content to listen to the radio and film tennis matches and the occassional experimental thing with puppets about political stuff.
Mario exists as a being of sheer wonder.
Born premature, Mario slid into the world as his mother climbed a staircase. His father was even more surprised.
Mario is the younger brother of Orin Incandenza and the older brother of Hal Incandenza.