Soul King/Expanded Universe

The is the creator of Soul Society, the Human World and Hueco Mundo, and served as the very linchpin that sustains the three worlds until he was killed and replaced by Yhwach. The Soul King is the very source of the power used by Quincy.

Personality
Not much is known about the Soul King's personality, or even his motivations. He seemed to greatly care about the original inhabitants of his world, killing countless Hollows to protect them regardless of the consequences.

Bleach: Can't Fear Your Own World
Millions of years prior to his death, the being that became known as the Soul King emerged from a chaotic, primordial world overrun by Hollows. To protect the original inhabitants of that world, the Soul King proceeded to annihilate all the Hollows that preyed upon them. However, these actions eventually started to destabilize the world.

In response, five powerful beings from that time decided to work together to fix everything, and for their own respective reasons, sealed an unresisting Soul King inside a crystal and used his omnipotent powers to split their world into three new ones: Soul Society, Hueco Mundo, and the Human World, and in the process created the cycle of life and death.

Despite the Soul King's lack of resistance, the five beings were unconvinced of the Soul King's cooperation and feared his immense power, and proceeded to tear off the Right Arm of Stillness and the Left Arm of Progress and tear out the Soul King's organs, leaving the Soul King trapped in an agonizing state between life and death for millions of years.

Powers & Abilities
Immeasurable Spiritual Power: The Soul King is stated to be immensely powerful; even the likes of Ichibē Hyōsube admits that the Soul King is a nigh-omnipotent being with no equals. The Soul King's power allowed him to effortlessly destroy numerous Menos-class Hollows, reducing them to mere sand.


 * The Soul King's signature power, which granted him nigh-omnipotence and nigh-omniscience, allowing the Soul King to see all futures. Ichibē Hyōsube speculates that the Soul King had foreseen everything that happened up until his death and even allowed for it to happen.


 * World Splitting: Through the Soul King's Almighty powers, the original world that exists was split into three new ones and the cycle of life and death was created.

Ōken Bestowment: The ability to turn the bones of other beings into an Ōken. Ichibē Hyōsube believes that the Soul King's very will exists, and can be felt, in every Ōken, even his own.

Detached Body Fragments
When the Soul King was sealed and dismembered by the Five Ancestors, numerous parts of his body were seperated and ended up in various parts of the three worlds. Some of these smaller fragments ended up in the Souls of Humans, granting them the potential to become Fullbringers; while other, larger parts attained sentience of their own.


 * The Right Arm of the Soul King - Ended up in Soul Society where it was worshipped as a deity in the Rukongai. Eventually bonded with Jūshirō Ukitake.


 * The Left Arm of the Soul King - Ended up in Soul Society. Eventually returned to the Quincy and came to serve Yhwach.


 * The Heart of the Soul King - Returned to the Quincy and bonded with the Sternritter Gerard Valkyrie.


 * The of the Soul King - Entered the Cycle of Reincarnation and eventually bonded with Aura Michibane.


 * The of the Soul King - Various fragments that bonded with Humans, turning them into Fullbringers. Most of them were collected and used  by Sōsuke Aizen to feed his incomplete Hōgyoku, or by Tokinada Tsunayashiro to aid in the creation of Hikone Ubuginu. One particular piece bonded with Rangiku Matsumoto until is was forcibly extracted by Aizen

Trivia

 * Although never outright confirmed, it is repeatedly implied to varying degrees in Bleach: Can't Fear Your Own World that Gremmy Thoumeaux may have been an aspect of the Soul King, like Gerard Valkyrie or Pernida Parnkgjas.

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