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 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. Most of Grimmjow's Fracción have high numbers, implying that they were among the first Números created. Wonderweiss Margera is apparently one of the strongest and the youngest Números to appear in the manga and the anime.

Fracción
The are a subsection of the Números that directly serve a specific Espada. The number of fracción for any given Espada varies: Starrk and Jiruga would seem to have just one, while Granz has at least a dozen. There are a few Espada that apparently prefer to fight alone, such as Yammy, Zommari, Aaroniero, and Ulquiorra, and chose not to have any fracción under their command. The fracción are all fiercely loyal to their respective Espada masters (due the the latter's impressive amount of power), perhaps even more so than they are to Aizen, and will diligently follow any order their masters give them.

Fracción Relationships
Lilynette's relationship with Starrk is unique amongst the Espada and their Fracción, appearing more comical and light-hearted. She does not address him with the -sama suffix (a Japanese title similar to Lord or Master), like the other Fracción do for their respective Espada, and simply calls him "Starrk". She acts more like a younger sibling than a servant, though Starrk does not seem to mind. Despite her usual attitude towards him, Lilynette is very confident in Starrk's abilities, actually warning Ukitake that it would be better to attack him two-on-one. This relationship may be due to because Starrk and Lilynette are one of the same being, separated in two, with Lilynette being Starrk's sealed powers.

Barragan's Fracción are fiercely loyal to him - possibly more so than they are to Aizen - and willingly obey his every command. His Fracción treat him like a king (referring to him as "his majesty"), with Poww going even further and seeing Barragan as a "god". Much like Barragan himself, they are all very arrogant and boastful. Barragan was angered when four of his underlings were killed, but out of anger for their failure rather than concern, and goes so far as to call them "trash". Contrasting the teamwork shown by Harribel's Fracción, Barragan's Fracción are highly independent of one another, and are never shown speaking directly to each other during the fake Karakura Town battle. This disregard for their allies in battle is shown most notably by Ggio Vega, who knocks Soifon into his fellow Fracción, Nirgge Parduoc, apparently killing the latter and showing absolutely no concern for him.

Harribel's Fracción respect her and take everything she says seriously. They themselves appear to have a strained, yet somewhat comical, relationship with one another. Despite this, they work quite well together, and are capable of using powerful combination attacks. Unlike most of the other Espada, Harribel actually genuinely cares about her subordinates and angrily assaulted Captain Tōshirō Hitsugaya when they were defeated by Head-Captain Genryūsai Shigekuni Yamamoto. She even commends them and acknowledges the fact they tried their best instead of scorning them for their loss.

Nnoitra's lone Fracción, Tesla, idolizes him and remains loyal to the end, despite Nnoitra's occasional mistreatment of him. Nnoitra himself cared for Tesla's well being enough to warn him of Kenpachi Zaraki's power and told him to run (though he insulted him while doing so and did not show any grief over his death). Tesla did not seem to have his admiration for Nnoitra while Nnoitra was the eighth Espada at that time; it is unclear what changed his mind.

Grimmjow's Fracción are loyal and obedient, but disregard their comrade, Di Roy, considering him the weakest of Grimmjow's Five Fracción, and reluctantly accepting his 'assistance' during Grimmjow's Assault on Karakura Town. Edrad Liones scornfully calls him 'an Arrancar in name only'. All of them are quite cocky, much like Grimmjow, and most appear rude and unwilling to even bother learning their opponents' names (with the exception of Shawlong). After they were killed during their invasion of Karakura Town, Grimmjow showed no signs of anger or sorrow, just surprise at the fact that an entire squad of Arrancar (excluding himself) was eliminated by "a bunch of low-level Shinigami". Interestingly, none of Grimmjow's Fracción used honorfics while refering to him.

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 Uryū Ishida. Szayel apparently treats them as mindless lab-rats whose only real purpose is to defend him from his enemies and for his experiments. Amongst the Espada, Szayel has by far the most Fracción.

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