Rukia Kuchiki
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.