Kūkyo no Joō

Kukyo no Joo (Queen of Emptiness) is the ultimate antagonist of the fanon Bleach: the Dark Times and is the progenitor of the Kaiju-Ningen species and is the accumulation of all the individual emptiness staining each soul. It created the Kaiju-Ningen to test the limits of its power but was destroyed by them. Its essence resurfaced when Chireru Amakuni became the first "Kūkyo no māku". Argus has since revived her into a new vessel. She currently exists in a heavily weakened state due to there being too few individuals with Emptiness-stained souls. Kukyo no Joo currently rests in the Dengai...

History
According to Mun Okami, a Shin no Kaiju who existed when the Kaiju-Ningen first transmigrated, Kūkyo no Joō was a entity devoid of all but the desire to create and destroy, created the Kaiju-Ningen species as a whole to test the limits of her abilities. She proceeded to kill the Kaiju-Ningen one by one, but did not anticipate the Kaiju-Ningen rallying together to defeat her. However, somehow the monster-human species could not destroy her as a whole. Her essence resurfaced due to Chireru Amakuni's unannounced shift to the Soul Society and becoming the first true Kūkyo no māku to exist since the Empty Queen herself. Through mass experimentation, the mad Arrancar Argus concluded that Kūkyo no Joō was originally an ordinary soul and created a replica body for her essence using Natsu Amakuni's DNA( as Argus reveals that the Empty Queen is in fact Natsu's ancestor) and mimicking Tazuma's Azauchi Tempering. Further research indicates that through accumulating the empty fragments from all the stain souls, her existence further degrades the equilibrium and that only another Kūkyo no māku could truly "kill" her. Argus joins the Munashi danpen to further increase her power and to weed out those he must eliminate. Currently, the only deemed threats to the Empty Queen's continuous existence is Totsuka, Tazuma and possibly Chireru Amakuni, though Argus assets that Chireru has yet the 'incentive' to join their ranks. Argus, with Natsu's blessing, enters Underground Tournament to increase the powers of the Empty Queen by injecting Emptiness unto others.

Synposis

 * Emptiness Unbound Arc
 * The Cure Arc

Powers and Abilities
Inyeccion De Vacio (Injection of Emptiness): Being the original source of Emptiness, the Empty Queen can instantaneously inject an individual with Emptiness and stain their souls without a Museigen nota jotai, further degraded the equilibrium and in turn increase her spirit potential just by physical contact.

Unknown spiritual pressure: According to Mun Okami, the Empty Queens' power before could be comparable to the Royal Guards. However, Argus mentions that since her revival her current power is fragile.

Unlimited growth potential: According to Argus, her growth is potentailly limitless, as her powers are linked to the Emptiness-stained individuals...

Trivia

 * this character is partially influenced by Phantom/Konoe of the BlazeBlue series.