Races:
•Fullbringer (完現術者 (フルブリンガー), Furuburingā; Japanese for "Full Manifestation Artist"): Fullbringers are a subset of Humans, being that they are living beings who are spiritually aware and were born with the eponymous ability Fullbring, which allows them to manipulate the souls that reside in all physical matter. Their powers are constituted by Hollow Reiryoku.
•Plus (整 (プラス), Purasu; Viz "Wholes"): A plus is a benign spirit of a Human that has died. A chain, known as the Chain of Fate, protrudes from the chest. This chain originally connected the Plus to their living body, but is severed upon death. Occasionally it binds the Plus to a location, object or person that they felt close to in life. Normally, pluses are sent to Soul Society by Shinigami in a ritual called Konsō (soul burial), but if the Chain of Fate is corroded entirely before a Konsō can be performed, the Plus will become a Hollow. If the Chain of Fate is torn out deliberately, this also leads to spiritual degradation.
•Shinigami (死神, Death God; Viz "Soul Reaper"): Shinigami are souls with inner spiritual power, recruited from the ranks of the residents and nobility of Soul Society. Like all spirits, they cannot be detected by normal Humans. Shinigami use their Zanpakutō, supernatural swords that are the manifestation of their owners' power, to perform soul burials on Pluses. Shinigami also use Zanpakutō and magic known as Kidō to fight Hollows.
•Visored (仮面の軍勢 (ヴァイザード), Vaizādo; Japanese for "Masked Army"): A group of Shinigami who have also obtained Hollow powers through "illegal" means, gaining removable masks and access to certain Hollow abilities.
•Hollow (虚 (ホロウ), Horō): The Hollows are evil ghosts who reside in Hueco Mundo, but travel to the Human World to feed on the souls of the living and dead alike. Like Shinigami, Hollows are made of spiritual matter and cannot be detected by ordinary Humans. While the majority of Hollows can be overcome by the average Shinigami, there are some which surpass even the most elite Shinigami in strength. All normal Hollows wear white masks and have a hole where their heart used to be.
•Arrancar (破面 (アランカル), Arankaru; Spanish for "To Tear Off", Japanese for "Ripped Mask"): Arrancar are Hollows that have broken off part of their Hollow mask. By shattering their masks, these Hollows regain the ability to reason, sometimes obtain a Humanoid form, and gain access to Shinigami-esque powers.
•Quincy (滅却師 (クインシー), Kuinshī; Japanese for "Monk of Destruction"): The Quincy are a clan of spiritually aware Humans who once fought against the Hollows, using weapons composed of spiritual energy to slay them. As opposed to Shinigami, Quincy absorb and channel energy from their surroundings to fight. Unlike the Shinigami method of killing Hollows which allows the Hollow to enter Soul Society, the Quincy technique simply obliterates the Hollow's soul entirely. This method has the propensity to shatter the balance of the universe, because when souls are destroyed, the number of souls entering and leaving Soul Society cannot remain equal. This issue prompted the Shinigami to conduct a campaign to exterminate the Quincy about 200 years ago, leaving very few survivors.
Zanpakutō Spirit: A Zanpakutō Spirit is the spirit embodying a Shinigami's Zanpakutō that resides within their master's inner world. A Zanpakutō Spirit is a part of their Shinigami's soul, and their appearance and abilities are a reflection of this; as such, they also share their master's resolve. They exist in tandem with their master; they are born alongside their Shinigami, and die with them. A Zanpakutō Spirit's power is separate from that of their owner, and when a Shinigami draws on this power in addition to their own, their Zanpakutō will become even stronger. They dwell within the inner worlds of their Shinigami masters.
•Tōjū (刀獣, Sword Beasts): Zanpakutō spirits who have lost their owners and now wander, lost and confused.
•Gikon (義魂, Artificial Souls): Artificial souls are a type of soul mass-produced by the Shinigami. Issued in pill form, they are used to force Shinigami out of their Gigai during protracted stays in the Human World, and also to evict pluses that refuse to leave their bodies after death. They come with a pre-programmed personality that animates the host body until the owner returns.
•Kaizō Konpaku (改造魂魄, Modified Souls): A series of experimental souls authorized and created by Shinigami researchers. Known as Modified Souls, these were meant to hunt Hollows by possessing soulless Human bodies and supercharging a particular aspect of them (for example, strength or speed). The Shinigami decided to scrap the project due to the inhumanity of forcing dead bodies to fight, and ordered the destruction of all modified souls.
Bount (バウント, Baunto): The Bounts are a clan of Human beings with high spiritual energy and special powers. They were accidentally created by Shinigami scientists looking for a way to create eternal life. Bounts consume the souls of Human beings to survive; theoretically, a Bount could live forever by doing so. Although the Bounts have a strict rule to consume only the souls of the dead, the final group of Bounts chose to drain souls from living Humans in order to become more powerful. Each Bount uses a "Doll" in combat, a type of familiar spirit possessing its own special abilities. Every doll is unique and is a manifestation of the user's power. If the doll is destroyed, its owner is destroyed as well.
Blank (欠魂 (ブランク), Buranku; Japanese for "Wan/Lacking Soul"): Blanks are souls who have lost their memories and reside in the Valley of Screams. Blanks are instinctively attracted to memories. Ganryū of the Dark Ones wanted to use the Blanks in a plot to collapse the Human world and Soul Society together by luring them with Senna, aka the Shinenju (Memory Rosary).
Togabito (咎人, Offenders; Viz "Sinners"): The Togabito are the inhabitants of Hell. These beings are equipped with numerous chains spanning the entire length of their bodies, which imprisons them in Hell.