RANKS
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T H R E E K I N G S
Aizen Sosuke:
Ichimaru Gin:
Tousen Kaname:
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E S P A D A
→Few hollows have the potential to remove their masks normally, and even if they manage it the change is not significantSōsuke Aizen is able to artificially create arrancar with the Orb of Distortion, which also unlocks much more of their potential than a natural transformation would. The process of turning a hollow into an arrancar is called shinigamification.
Arrancar and ordinary hollows differ in two ways: the location of their holes and the near-total disappearance of their masks. When hollows become arrancar, the chances of them retaining a humanoid form increase with their intelligence; only vasto lorde-class arrancar will definitely assume a humanoid form. If powerful enough, an arrancar can seal his or her excess power into the form of azanpakutō. Unlike with shinigami, this zanpakutō is simply the hollow's true form sealed into a sword. Therefore, an arrancar's release of their zanpakutō is merely a temporary restoration of their former selves. An arrancar release is called resurrección. Arrancar do not have a known second release.
Stark: 
Halibel: 
Barragan: 
Ulquiorra Schiffer:
FaggoLord
Nnoitra Jiruga: 
Grimmjow Jeagerjaques:
Zommari Leroux: 
Szayel Aporro Granz: 
Aaroniero Arruruerie: 
Yammy:
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F O R M E R_E S P A D A
Neliel Tu Oderschvank:
kairiXhinataXhyuga65
Luppi:
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►P R I V A R O N:
→The Privaron Espada are former Espada who have officially lost their rank and are assigned a three-digit number. Being former Espada, they are far stronger than the normal Números. They reside in Tres Cifras, which translates literally from Spanish as "three digits". As mentioned by Dordonii, these former "naturally created" Espada were rendered obsolete after Aizen began artificially creating arrancar to meet his own standards.
Dordonii Alessandro Del Socacchio:
Cirucci Thunderwitch:
Gantenbainne Mosqueda:
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N U M E R O S

→The Números are the combat specialists. They are assigned a two digit number at birth from 11 to 99 to indicate their age (Número 11 is the oldest, Número 99 is the youngest). The basic Número uniform consists of a white-collared jacket and robes held with a black sash. However, the uniform is customizable, giving each Número a sense of individuality. The fighting ability of Números is thought to be superior to all other arrancar, except for the Espada (current and former).
Wonderweiss Margera:
11. Shawlong Koufang [see picture above. position: 2nd from the right]:
13. Edrad Liones [see picture above. position: leftmost]:
15. Yylfordt Granz [see picture above. position: bottom]:
16. Di Roy [see picture above. position: rightmost]: