An elite Knightmare Frame pilot and a Purist, who appears to be more collected than Jeremiah in battle. She was one of the first to have been under the power of Geass' influence and is one of the few still loyal to Jeremiah even after his fall in disgrace.

When Lelouch leaves to attack the Geass Order, Villetta goes to the Chinese Federation to confront Ohgi, intending to kill him to eliminate her links to the Elevens. She hesitates when Ohgi admits his love for her. She is captured after an altercation with Sayoko, but is eventually released and leads Ougi to believe Zero cannot be trusted. She remains with the Black Knights following this. It is revealed that she is pregnant with Ohgi's child and she remains on Horai Island when the Black Knights depart to battle Lelouch. At the end of the series Villetta marries Ohgi.