C.C. is a fictional character from the anime and manga series Code Geass. She is known for her long green hair and her mysterious, immortal nature. C.C. plays a crucial role in the story as she grants the protagonist, Lelouch Lamperouge, the power of Geass, which allows him to command others to obey his orders. In addition to her powers, C.C. has a complex personality, often displaying a mix of aloofness and deep emotional layers. Her backstory reveals her struggles and the burdens of her immortality, making her a significant figure in the series' exploration of themes like power, sacrifice, and the human condition.