C.C. from Code Geass

C.C (シー・ツー, Shī Tsū) (also known as C2) is one of the central characters in the Code Geass: Lelouch of the Rebellion anime series by Sunrise. Her Japanese seiyuu is Yukana while she is voiced by Kate Higgins in the English dub.

* Nickname: "Gray Witch"
* Age: 16 (on the surface)
* Height: 160 cm (5'3")

A mysterious green-haired girl who bestows the power of Geass upon Lelouch under the condition that he would grant her greatest wish. C.C. passively oversees Lelouch's missions to ensure that he doesn't die, which would implicate her situation greatly. She dies from a bullet wound to her head in the first episode but later revives and shows up alive at the Lamperouge residence, where she acquaints herself with Nunnally, who initially mistakes her for Lelouch's girlfriend. She was apparently part of Britannia's experimentations in the past, and although she appears to be in her teens, C.C. is apparently much older than she seems. In the opening sequence of the first episode, she is seen observing Suzaku and Lelouch when they were both children. Her name is pronounced as C-two. When by herself, she sometimes communicates with an unrevealed entity(s) via electromagnetic waves.
-From Wikipedia