Code Geass C.C.'s Abilities

C.C. has the power of the "Code", which renders her immortal, capable neither of aging nor of being killed by conventional means. She has been shot fatally a number of times, crushed by water pressure, burned at the stake, beheaded by a guillotine, and placed in an iron maiden, and each time she survived and eventually recovered. C.C. also has the ability to bestow people with the power of Geass, which manifests differently in each person but generally carries the ability to affect the minds of those it is used on in some way.

When touching another person, C.C. can afflict them with a hallucinatory experience (if need be) of chaotic and ominous images, pertaining in part to the memories of the target involved; the content varies with the afflicted. Physical contact, either direct or via a Knightmare Frame, may facilitate the process. Suzaku is shown images of his father (whom he murdered) as well as parts of C.C.'s memories, driving him into a panic. It tends to activate involuntarily at various points, such as when Lelouch's Geass becomes permanently active. This effect is described as 'a merging of consciousnesses'. The Geass sigil on her forehead glows whenever she manifests this power.

She is also able to cancel the effects of Geass from a person, this power being the reason she was being studied by Bartley Asprius. The only time she is seen using it however is when she releases Lelouch from his father's Geass. Bartley successfully copied this ability and from this created the Geass Canceler, which he then implanted into Jeremiah Gottwald. It is unknown whether this power manifests itself in any "Code" bearer or C.C. is a special case.

Apart from psionic abilities, C.C. is a capable leader, able to rescue Lelouch from Britannian traps, handle firearms with some proficiency, and seems to be a skilled unarmed fighter as well. She is also an accomplished Knightmare pilot, able to pilot both standard Knightmare Frames as well as copilot the Gawain with Lelouch. In the Picture Dramas, during a discussion with Kallen, she states that she has the ability to do almost anything but chooses to let others do it.

Geass
Before becoming immortal, C.C.'s Geass, as contracted with a nun during apparently medieval times, granted her the power "to be loved," which allowed her to make anyone love her unconditionally. She originally started with a Geass symbol in her left eye, but as the power matured, she eventually developed another in her right eye, and became unable to control it, causing everyone to love her except the nun. After she became bored by the entranced society around her, the nun who had bound the Geass contract to her forced her "Code" into C.C., as signified by the Geass sigil on the nun's forehead transferring to hers. The ordeal also burned a similarly-shaped scar under her left breast. The nun, freed of the "Code", dies, and C.C. takes up the "Code" and everything that goes with it: the loss of her original Geass, immortality, immunity to other Geass, and the ability to bestow Geass on others.

Code Geass C.C. in Second Season

At the start of the second season, C.C. appears to be commanding the Black Knights. She and the rest of the surviving Black Knights initiate an operation to unlock Zero's memory that was sealed away by the Emperor of Britannia. Despite the Intelligence Agency having followed Lelouch in anticipation of that exact outcome, she is successful in restoring his memories by the kiss. She takes up her old position following this.

After pinpointing the location of the Geass Order, Lelouch orders C.C. to lead the attack against it. She reluctantly kills V.V.'s direct subordinates when they attempt to escape by bullet train in order to bury the existence of Geass, apologizing for leaving them to their own devices. C.C. later reveals her wish to Lelouch after he is transported to the Sword of Akasha to face the Emperor, explaining that her greatest wish is to die and as Lelouch is not ready, she is offering it to Charles. Lelouch tells her she shouldn't die looking unhappy, promising he will make her smile while saving her. However, in the attempt, C.C.'s memories of everything past the day she acquired her Geass are lost, reverting her to a frightened slave girl. Believing himself to be responsible, Lelouch confines C.C. to his quarters and attempts to make her comfortable.

After Lelouch's identity is exposed to the Black Knights and he evacuated by Rolo, Marianne takes over Anya's body and uses it to locate C.C. and restore her memories. The two then leave for Kamine Island, rescuing Suzaku along the way. Marianne enters the Sword of Akasha, while C.C. stays behind to speak with Suzaku. She compares herself to him, as both have a death wish they cannot fulfill. Suzaku denies this and has C.C. take them to the Sword of Akasha. C.C.'s presence allows the Emperor to begin the Ragnarök Connection. When Lelouch turns the tables and the collective unconsciousness destroys Charles and Marianne, C.C. is spared their fate because she has turned against their plan.

Later on, after Lelouch seizes the Britannian throne, C.C. comforts him when he is troubled on what to do about Nunnally being aligned against him. Before heading into battle, C.C. asks Lelouch if he hates her for giving him Geass and changing his fate. Lelouch explains that he's grateful, both to Geass and her, for allowing him to move forward. She smiles and says this is the first time she's ever met a man like him. Lelouch says her name and the begin walking toward each other. They are interrupted when Kallen attacks in the Guren, ready to kill Lelouch. C.C. intervenes in her Lancelot, buying Lelouch time to escape, telling him to come back so he can make her smile. She engages in battle against Kallen. During their battle, Kallen questions her lack of motivation, and asks if C.C. loves Lelouch. C.C. isn't sure about the latter, still wanting to put an end to her unending life. C.C. is easily defeated, but ejects to safety, surprised that she even cares about winning or losing. During Lelouch's planned assassination, she prays for him at a church, shedding a single tear while commenting on the price he's paying for using Geass on others.

During the epilogue, C.C. is seen traveling the countryside in the back of a cart. She talks about how the Geass is supposed to bring loneliness, yet Lelouch proved this wrong. With the knowledge that Lelouch did not hate her for giving him the Geass, she is now able to express her true feelings addressing Lelouch, leaving his fate somewhat ambiguous.