Números

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

Overview
The Números are assigned a two digit number at birth from 10 to 99 to indicate their age (Número 10 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. Most of Grimmjow's Fracción have high numbers, implying that they were among the first Números created. Wonderweiss Margela is apparently one of the strongest and the youngest Números to appear in the manga and anime.

Fracción
The (Fracciónes in the English dub; Spanish for "Fractions") are a subsection of the Números that directly serve a specific Espada. The number of fracción for any given Espada varies: Nnoitra has just one, while Szayelaporro has at least a dozen. There are a few Espada that apparently prefer to fight alone, such as Yammy, Aaroniero Arruruerie, Zommari Rureaux, and Ulquiorra Cifer, and chose not to have any fracción under their command. Also, Coyote Starrk's other half, Lilynette Gingerbuck, has a fracción-like relationship with the former, but cannot be considered an actual fracción due to that she was originally a part of an Espada. The fracción are all fiercely loyal to their respective Espada masters (such as Baraggan's and Harribel's), perhaps even more so than they are to Aizen, and will diligently follow any order their masters give them.

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Números