С.C. (C2) is a mysterious and enigmatic character in the anime series Code Geass. She is an immortal and powerful woman who grants the power of Geass to those she deems worthy. C.C. forms a contract with the protagonist, Lelouch Lamperouge, and aids him in his quest for revenge and revolution against the Holy Britannian Empire.

C.C. has a complex and troubled past, as she has been used and betrayed by many throughout her long life. Despite her cold and aloof exterior, she shows moments of vulnerability and loneliness, hinting at a deep emotional turmoil underneath her seemingly emotionless facade.

Throughout the series, C.C. plays a key role in shaping Lelouch's character and decisions, as well as providing insight into the true nature of Geass and its consequences. Her relationships with other characters, particularly Lelouch and Suzaku, are central to the plot and add layers of depth to her enigmatic personality.

Overall, C.C. is a captivating and enigmatic character in Code Geass, whose mysterious aura and complex backstory make her one of the most intriguing figures in the series.