Thần Chết Ichigo - Chapter 171

Aizen spent much of his career in the 5th Division,[1] eventually becoming its lieutenant under the former captain, Shinji Hirako.[2] Aizen also gained followers in Gin Ichimaru and Kaname Tōsen. A century before the series' setting, after Kisuke Urahara created the Hōgyoku, an item that he believed creates Soul Reaper/Hollow hybrids, Aizen began to experiment using the Soul Reapers that became the Vizards. Among his test subjects was Shinji, who knew Aizen was up to no good but learned too late that Aizen used his mistrust against him. Having also framed Kisuke for the Vizards' creation and forced his exile, Aizen learned the Hōgyoku actually grants its user's desires if they have the will to carry it out. But as Kisuke took the Hōgyoku with him, Aizen bides his time to take the item when the time comes.

At some point, Aizen saw the potential of Shuhei Hisagi, Momo Hinamori, Izuru Kira and Renji Abarai, and Aizen took the latter three into his division. Aizen also continued his experiments on Soul Reaper/Hollow hybrids with his creations Metastacia and White playing a respective role in the life of Rukia Kuchiki and those of Isshin Shiba and Masaki Kurosaki.

Sometime prior to his departure from Soul Society, Aizen and his two followers travelled to Hueco Mundo by arranging an alliance with the self-proclaimed god king of Hueco Mundo, Barragan Luisenbarn.[3] As Barragan refused, Aizen revealed all of the Hollow's minions were killed during the discussion and forces Barragan into servitude. From there, Aizen appropriates Barragan's palace Las Noches and reconstructs it in his own image, recruiting Tier Halibel and the other Arrancars that would become his Espadas.

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