シーツー

C.C. ( pronounced "C2") is an immortal "witch" who bestows the power of Geass upon Lelouch under the condition he grants her greatest wish. (later revealed to be for Lelouch, let alone anyone, to kill her.)/ She oversees Lelouch's activities and assists in his plans in order to ensure that he remains alive to fulfill their contract. She is the main female protagonist of the anime series. Lelouch often refers to her as the witch and himself as the "demon lord". She is seen to be quite close to Lelouch and advises him whenever he is feeling lost. C.C. often comes to get Lelouch out of a tough situation when his identity is about to be revealed. Despite this, she routinely gets on his nerves, often sneaking out without his permission or ordering Pizza Hut (which sponsors Code Geass in Japan) with his credit card. 

From url=https://en.wikipedia.org/wiki/List_of_Code_Geass_characters#Main_characters.