Zero
Zero is the masked identity adopted by Lelouch vi Britannia in the Code Geass franchise. Using his Geass—the power to command absolute obedience—and strategic genius, Lelouch leads the Black Knights as Zero against the Holy Britannian Empire, concealing his face and name to protect his sister Nunnally vi Britannia and to unite resistance forces under a single symbol.
The identity appears across Code Geass: Lelouch of the Rebellion, R2, and Lelouch of the Re;surrection. The Zero Requiem repurposes the mask for Lelouch’s final plan.