Números

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

Overview
The moment they are "reborn" from Hollows into Arrancar, each member of Aizen's army is assigned a two-digit number, starting with 11. This number indicates not the order of their strength, but of their birth. Thus, the higher an Arrancar's number, the younger they are. The strongest among the Números can be handpicked by Aizen and promoted to Espada.

The Números do not have an established uniform, but they all wear white clothing.

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 prefer to fight alone, such as Yammy Llargo, Aaroniero Arruruerie, Zommari Rureaux, and Ulquiorra Cifer, and chose not to have any fracción under their command. The fracción are all fiercely loyal to their respective Espada masters (such as Baraggan's and Harribel's) and will diligently follow any order their masters give them.

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Números