Unlock the following character by performing the corresponding tasks:

Byakuya Kuchiki
Complete "Byakuya's Cooperation" in Free Time mode.
Defeat him in Bleach tower, Level 9.Gin Ichimaru
Defeat him in 5 turns (before Izuru) in Bleach Tower, Level 6.Hanatarou Yamada
Complete "Hanatarou's Cooperation" in Free Time mode.
Defeat him in Bleach Tower, Level 7.Hinamori Momo
Complete "Hinamori's Cooperation" in Free Time mode.
Defeat her in Bleach Tower, Level 8.Izuru Kira
Complete "Izuru's Cooperation" in Free Time mode.
Defeat him in Bleach Tower, Level 6.Kaname Tousen
Defeat him in Bleach Tower, Level 12.Kusaka
Have Hitsugaya defeat him and complete Bleach Tower, Level 21.Renji Abarai
Complete "Renji's Cooperation" in Free Time mode.
Defeat him in Bleach Tower, Level 9.Retsu Unohana
Complete "Unohana's Cooperation" In Free Time mode.
Defeat her in Bleach Tower, Level 7.S. G. Yamamato
Complete "Yamamato's Cooperation" In Free Time mode.
Defeat him in Bleach Tower, Level 4.Sajin Komamura
Complete "Komamura's Cooperation" In Free Time mode.
Defeat him in Bleach Tower, Level 10.Shaolin Fong (Soi Fon)
Complete "Soi fon's Cooperation" in Free Time mode.
Defeat her in Bleach Tower, Level 5.Shunsui Kyoraku
Complete "Kyoraku's Cooperation" in Free Time mode.
Defeat him in Bleach Tower, Level 11.Shuuhei Hisagi
Complete "Hisagi's Cooperation" in Free Time mode.
Defeat him in Bleach Tower, Level 12.Yoruichi Shihouin (Current)
Complete "Yoruichi's Cooperation" in Free Time mode.
Defeat her in Bleach Tower, Level 5.Yoruichi Shihouin (Former)
Defeat her in Bleach Tower, in the level she is in with Kisuke Urahara.