Height: 160 cm (5'3") - 164 cm (5'4")

She is Lelouch's younger sister who is wheelchair-bound due to old bullet wounds on her legs, and blind due to psychological trauma. Lelouch believes that she may be able to see again someday. They live in Kururugi Residence where she first met Suzaku Kururugi.

After Britannia invades Japan, Lelouch hides their identity in fear of their safety and changes their surname to Lamperouge. They then seek help from Marianne's old allies, the Ashford family, who kept their identity a secret and allows the two siblings to live in a building on campus to accommodate her disabilities. Nunnally attends Ashford Academy's middle school and is friends with Lelouch's classmates, particularly with Shirley. She is very kindhearted and calls the Elevens "Japanese people".