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Charismatic leader of the Black Knights whose identity remains a mystery even as his group rises to power and fame throughout the world.
Zero is the alter-ego of Lelouch and leader of the Black Knights. Often, Lelouch uses the mysterious identity of Zero in order to engage in campaigns against the Britannian Empire without drawing attention to himself or his friends. The mask of Zero has a small retractable slot on the front that allows Lelouch to use his Geass when he finds it necessary. As the first season goes on, Zero himself becomes a greater symbol for the cause of Japanese independence, though some of his own followers begin to doubt him when he mysteriously disappears from battle at the end. Suzaku and Kallen finally confirm that Lelouch is indeed the one behind the mask
In the second season, C.C. occasionally dons the costume to keep up the ruse that Lelouch doesn't remember his true identity. Later on, when the Black Knights have been resurrected, Zero strikes a deal with the Britannian Empire to let them forcibly exile Zero in order to stop the Black Knights from conducting more attacks within Area 11. However, all of the Japanese rebels don their own Zero costumes, following the real Zero into exile. At the end of the series, after Lelouch becomes the Emperor of Britannia, Zero re-appears and stabs him through the chest with a sword. It is later revealed that Suzaku is the one playing this role, and Lelouch planned it so that the world would finally be at peace after he became its most hated enemy.
Knightmare for Nunnally Version In Code Geass, manga spin-off called Knightmare of Nunnallly Zero is pictured with more power and strength as Lelouch takes on Zero again although there are time when it would seem like CC is Zero