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In the very beginning, it was a program that I designed to counter a military project, based on a multi-agent system.
~ XANA himself while posing as Franz Hopper.
A super dangerous program, like a virus, which can control electricity, and activates Towers on Lyoko in order to gain access to your world.
XANA is the main antagonist of Code Lyoko. It is a sentient and dangerous computer virus that infects the Supercomputer that holds Lyoko. It seeks world domination and to eliminate the obstacles that stand in its way, the Lyoko Warriors.
XANA is a dangerous computer virus with a mind of its own. It becomes a powerful and dangerous enemy force with the goal of spreading destruction and world conquest. XANA can calculate plans and even use human feelings to deceive and manipulate others, but is bound by logical patterns, making it very simple and easy to predict. It also never takes risks or repeat the exact same plan twice.
At first, XANA only launches random attacks to menace the world. As it becomes stronger and smarter, XANA conceives of greater goals to use attacks as a means to achieve them every season. XANA's main desires are to survive, destroy its enemies, and take over the world network for the means to conquer the Earth.
It usually has the simple mindset of a hostile force with some intelligence among the virus extensions and creatures that share its mind. With spectres, X.A.N.A. can act manipulative and deceitful to fool others, unrelenting and merciless with its objectives, and becomes egomaniacal and taunting when having the advantage.
Powers and Abilities
XANA is a computer virus that can take over systems, like the Supercomputer and Lyoko. Its multi-agent system lets it control many at once and manifest extensions to act on Earth while staying on Lyoko. It was formerly bound to the machine, but after stealing the Keys to Lyoko, XANA can spread outside of Lyoko and create Replikas, copies of Lyoko, within other infected machines in the world network.
To act on Earth, XANA needs to activate structures on Lyoko, called Towers. The only way to stop it is by deactivating them. It manifests parts of itself as unearthly virus entities that infiltrate networks and emerge as ghostly spectres from outlets at will to interact with the real world.
XANA uses many unnatural powers through them, mostly to possess objects or living things (machines, inanimate objects, chemicals, natural forces, plants, animals, etc.) like a virus to manipulate at will. It can also control electromagnetic energies to project lightning, cause short circuits, affect the environment, and generate hypnotic signals from networks. XANA eventually grows strong enough to create pixelized vessels with these powers on Earth, by possessing humans or manifesting polymorphic spectres that transform into human forms. Only Lyoko Warriors cannot be controlled. They return to normal when the Towers deactivate and humans remember nothing that happened.
With Towers, XANA can also materialize or teleport Lyoko minions to Earth through Scanners or Replikas, control special devices it has built, or show psychic visions to those linked to the Supercomputer.
Monsters & Programs
On Lyoko, XANA controls the systems and uses them to program monsters to fight and attack targets, like Kankrelats, Bloks, Hornets, Krabs, Megatanks, Tarantulas, Creepers, Mantas, Kongres, Sharks, and the Kalamar. It also created the Scyphozoa to steal memory, drain energy, or brainwash warriors. Using the power of its Replikas, XANA can send the titanic Kolossus, its largest and most powerful monster to dominate any virtual world.
It can also use programs to alter sectors, create virtual prisons, use bugs and viruses, and manipulate incomplete warriors or even retrieve deleted ones to bind to itself. It can also program equipment and vehicles for its own warriors.
XANA is a computer virus in the Supercomputer that keeps an unseen presence in its systems. It has no actual physical form, other than the spectres that it generates into the real world to perform actions using a simple part of its multi-agent system, while its core self remains anchored to the Supercomputer.
In the episode "Ghost Channel", XANA appears for the first time inside a virtual simulation of the real world as XANA knows it. This manefiestation is theorized to be XANA's true self, since it acts with more anger and sadism than any of its programs and considering its behavior when it broke down trying to compute a logical fallacy. The manifestation is a demonic caricature of Jeremy that acts as the controller of its simulated world, and it was destroyed when Aelita dispersed the bubble with her powers.
The second direct appearance of XANA was at the end of "The Key", where an enormous mass of a spectre was seen spiraling into the sky from the factory as the program escaped Lyoko. This is only form of XANA to be confirmed in-universe as its true form, since it was seen leaving the Supercomputer as a collective force rather than a weaker part of itself.
The third and final incarnation of XANA was the spectre that appeared in "Fight to the Finish". The spectre itself had the unique ability to possess William in the real world, despite him being scanned by the supercomputer. The other unique feature is the misshapen Eye of XANA that appears on its torso, of which no other spectre has had. This spectre is assumed to be XANA's real-world form since it expressed pain that went in tandem with XANA's ultimate destruction.