Villetta Nu is a dark skinned elite Knightmare Frame pilot and
subordinate of Jeremiah Gottwald, though she is more collected than Jeremiah
in battle. She is not of noble blood, but supports Jeremiah and the Purist
faction as she believes she can earn a title of nobility through them.
Shortly after gaining the power of Geass, Lelouch uses it to make Villetta
relinquish her Knightmare, leaving her confused as to what happened. Though she
dismisses it at first, she begins to suspect Lelouch after Jeremiah experiences
similar memory loss after odd behavior. When Jeremiah is supposedly killed during
the Battle of Narita, Villetta steps up her attempts to find the connection
between Lelouch and Zero with the help of Shirley Fenette. After discovering
that Lelouch is Zero, Shirley shoots Villetta to protect Lelouch, causing amnesia.
She is found by Kaname Ohgi, with whom she lives with for a time. He gives her the name
Chigusa for lack of her real name. The two fall in love, but after unexpectedly
regaining her memory at the end of the season, Villetta is disgusted at the thought
that she ever loved an Eleven. She confronts him during the Black Rebellion and
reveals her true identity, then shoots him in the stomach.
In the second season, her knowledge of Zero's identity and of his Geass has
earned a title of nobility. She is employed by Britannian Intelligence
to observe Lelouch for contact with C.C. at Ashford Academy, using the cover
identity of a gym teacher. Villetta still seems to have feelings for Ohgi, breathing
a sigh of relief when he is saved from his execution before quickly regaining her
normal composure. After discovering their previous relationship, Lelouch uses the
knowledge to blackmail her into hiding the fact he has recovered his memories.
When Lelouch leaves to attack the Geass Directorate, 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 convinces Ohgi of Zero's
treachery. 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, she is married
to Kaname Ohgi.
She is not present in the manga adaptation with most of her role taken over by other characters.