Forces of Darkness
Those who stand in Sora’s way include the Heartless and Nobodies as well as those who control them including Organization XIII and the Villains. Sora and the others must fight with these forces of darkness in order to bring peace to the Realm of Light.
One without a heart is darkness born from the recurring darkness. The embodiment of the darkness in one’s heart which appears when a person’s heart is lost to darkness. They have no knowledge or will, they simply run on dark instinct and go after the Hearts of Worlds as well as try to steal hearts from those with them in order to become greater in numbers.
There are various kinds of Heartless, but they are generally categorized in two main types; those who appear naturally are known as “Pure Blood”, and approximately 10 years before KH1, during an experiment Xehanort (Seeker of Darkness Ansem) birthed the “Emblem” Heartless. Heartless began appearing in greater numbers in the Realm of Light due to Ansem’s interference, and when he was defeated in KH1 it helped keep the numbers down, however as long as darkness exists within people’s hearts, there will always be Heartless.
Many of the dark forces which Sora comes up against who use Heartless end up themselves falling to the darkness and becoming possessed by the Heartless.
These Heartless come into existence naturally. If they are defeated with a Keyblade, the heart will be liberated. Many of the Heartless in the world are these.
The Realm of Darkness is overrunning with Pure Bloods.
Xehanort and the other apprentices of Ansem created these Heartless through experiments of causing darkness within hearts. As proof of their dissension from Xehanort, they all include the “X” shape forged into their emblems.
Examples: Soldier, Sea Neon.
Counterpart of the Heartless they are essentially not anyone and are dark monsters given an appropriate name. They come into existence when a person with a strong heart becomes a Heartless. Most of them are white bodied creatures, but a special few with especially strong hearts are able to retain their human forms when they become Nobodies.
Countering the existence of a Heartless being the darkness from a heart, Nobodies are the body and soul detached from the heart. Despite having no emotions, Nobodies have memories and intellect and are able to work in groups, and because their existence is precarious, if they are left alone, eventually they will melt into the darkness.
If a heart is liberated from the Heartless and a Nobody is destroyed, the human form will be restored.
Organization XIII members are able to give orders to lesser Nobodies.
Born from feelings of anger and hatred, these dark monsters receive their names from not being well versed in their own existences. In KH BbS they appeared in the Realm of Light, frightening all the people around. They were materialized from the collected negative emotions from Vanitas, and when Vanitas was defeated by Ventus they vanished.
They are creatures who nest in the worlds trapped in sleep and feed on dreams. They are separated into those who cause nightmares: “Nightmare” and those who eat nightmares: “Spirit,” and the Spirits will lend their powers to Sora and Riku.
Examples: Meow Wow (Nightmare), Meow Wow (Spirit).
A group of powerful Nobodies who retain their appearances from when they were human. The organization is made up of 13 members and all of their names have been rearranged from their human names into anagrams including the mark of dissension, the letter “X.”
These Nobodies realize that they are incomplete existences and believe that if they complete the Kingdom Hearts of People’s Hearts they can become whole again, but they were destroyed by Sora and his friends. However, the secret goal of the organization was to supplement the 13 Darknesses, and when near completion would begin again as True Organization XIII.
Members: Xemnas, Xigbar, Xaldin, Vexen, Lexaeus, Zexion, Saïx, Axel, Demyx, Luxord, Marluxia, Larxene, Roxas and Xion.
No. 1 ~ 6 were the apprentices of Ansem the Wise, and the final member Xion was not considered an official number thus she was given the number “i” as an imaginary number.
True Organization XIII
Xehanort and his other forms make up the 13 Seekers of Darkness. They make up the 13 Darknesses and intend to clash with the 7 Lights in order to forge the χ-Blade. In KH 3D there are 12 members ready in the organization and of those 12 the current 6 known to Sora and his friends are Master Xehanort, Ansem, Xemnas, Xigbar, Saïx, and Young Xehanort.
Maleficent and Pete among others who appear as the antagonists in Disney films make up this group. Using the Heartless and dark powers they try to stop Sora from succeeding in his journeys.
In KH1, Maleficent and the other Villains conspire to obtain Kingdom Hearts.