Antonia Lirimonie Norfedras Papenorgas Arecroteles Cnorses Morfenoss is a wealthy 12-year-old Greek-American girl and the founder/leader of the "Underside of Kitten Paw" cult, often called the "Cat Ear Church." Motivated by boredom and desperation, she established this group to venerate the Catians, specifically idolizing Eris as the epitome of physical perfection. Her privileged upbringing fuels notable competence across various activities.

Physically, Antonia appears youthful, standing 1.45 meters tall and weighing 30 kilograms. She has blue eyes, blonde hair cut to neck length, and measurements of 50-45-50. As a symbol of her devotion, she rarely appears without wearing cat ears.

Antonia employs two personal maids: Sara, identifiable by blonde hair and an eyepatch, is a former mercenary whose weakness for all things cute and catlike led to her attachment to one of Eris's Assist-A-Roids; and Maya, distinguished by long reddish hair and a cheek scar, who leverages her connections with the KGB to procure cutting-edge technology, such as intercontinental ballistic missiles repurposed as spacecraft parts.

Her actions include orchestrating the capture of Kio Kakazu and Eris using her maids, though this plan ultimately fails. Later, after Kio undergoes a temporary transformation into a catboy during a mission, Antonia develops a distinct attachment to him, consistent with her fascination for felinoid traits. While her leadership and considerable resources drive the cult's operations, its influence remains primarily confined to her personal endeavors.