Números

are the combat specialists in Sōsuke Aizen's army of Arrancar.

Outline
The Números 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 the Números is thought to be superior to all other arrancar, except for the Espada (current and former). The strongest Números are chosen by the Espada to become their Fracción.

Números

 * Shawlong Qufang - The 11th
 * Edorad Leones - The 13th
 * Yylfordt Granz - The 15th
 * D-Roy - The 16th
 * Wonderwice Margera
 * Loly
 * Menoly
 * Demōra (Deceased)
 * Iceringer (Deceased)
 * Patros (Deceased)
 * Menis (Deceased)
 * Aldegor (Deceased)

Fracción
The are a subsection of the Números that directly serve a specific Espada. The number of Fracción for any given Espada varies: Stark and Nnoitra Jiruga would seem to have just one, while Szayel Aporro Granz has at least a dozen. There are a few Espada that apparently prefer to fight alone, such as Yammy, Ulquiorra Schiffer, Zommari, and Aaroniero, and chose not to have any Fracción under their command.

List of Fracción
Barragan Luisenbarn's Fraccion:
 * Pō - (Deceased)
 * Findor Carias - (Deceased)
 * Avirama Redder - (Deceased)
 * Charlotte Coolhorn - (Deceased)
 * Two Unnamed Fracción

Halibel's Fracción:
 * Apache
 * Mila-Rose
 * Sun-Sun

Stark's Fracción:
 * Lilinette

Nnoitra Jiruga's Fracción:
 * Tesla - (Deceased)

Grimmjow Jeagerjaques's Fracción:
 * Shawlong Qufang - (Deceased)
 * Edorad Leones - (Deceased)
 * Yylfordt Granz - (Deceased)
 * D-Roy - (Deceased)
 * Nakim - (Deceased)

Szayel Aporro Granz's Fracción:
 * Lumina - (Deceased)
 * Verona - (Deceased)
 * Medazeppi - (Deceased)

Neliel Tu Oderschvank's Fracción:
 * Pesche Guatiche
 * Dondochakka Bilstin
 * Bawabawa

Fracción Relationships
Stark's relationship with Lilinette is something of mix between Captain Kenpachi Zaraki and Lieutenant Yachiru Kusajishi's of the Eleventh Division, Captain Shunsui Kyōraku and Lieutenant Nanao Ise's of the Eighth Division, and Shinji Hirako and Hiyori Sarugaki's. Lilinette's relationship with Stark is also unique amongst the Espada and their Fracción, appearing more comical and light-hearted. She does not address him with the suffix Sama (A japanese suffix similar to Lord or Master), like the other Fracción do for their respective Espada, and simply calls him "Stark". She acts more like a younger sibling than a servant, though Stark doesn't seem to mind.

Halibel's Fracción respect her and take everything she says seriously, as they should given an Espada's immense amount of power. They may even be somewhat intimidated by her given their facial reactions when she told them that it's 'understandable to be afraid' of an Espada's Resurrección form. They themselves appear to have a strained, yet somewhat comical, relationship with one another.

Barragan's Fracción are fiercely loyal to him and even consider him as their 'god'. Much like Barragan himself, they are all arrogant and somewhat foolhardy compared to the other Fraccion.

Nnoitra's lone Fracción, Tesla, idolizes him and treats him as a sort of 'king'.

Grimmjow's Fracción are loyal and obediant but disregard their comrade, D-Roy, calling him the weakest of Grimmjow's Five Fracción, and reluctantly accepting his 'assistance' during Grimmjow's Assault on Karakura. Edorad Leones scornfully calls him 'an arrancar in name only'.

Szayel's Fracción are more like cloned drones than henchmen and he shows little to no concern over them, even going so far as to cannibalize them in order to replenish his strength and regenerate his wounds, as seen during his fight with Renji Abarai and Uryu Ishida.