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|“||There is only one Kenpachi every era. That is, a rule, and also an unavoidable destiny. Because, when a strong person finds another strong one, they stop using the sword just for themselves. Suddenly, their sword, is used to either kill or raise the other strong person||„|
|~ Yachiru Unohana|
Yachiru Unohana (卯ノ花 八千流, Unohana Yachiru) is the previous villainous identity of Retsu Unohana. Before her life as 'Retsu', Yachiru is formerly known as the most notorious criminal and serial killer to ever exist in Soul Society.
Beside her identity as criminal, Captain Yamamoto sought her to be one of the co-founders of Gotei 13 and become the first "Kenpachi" or the captain of the 11th division.
When she known as the gentle, kind-hearted and warm captain and extremely caring with her subordinate at the 4th division, her true hidden personality is completely different when she was known as Yachiru.
When Captain Kyoraku reveals her true identity, Unohana revert to her very dark-true persona. Unohana is a blood-thirsty, emotionless and violent serial killer, which make her become one of most diabolical and notorious criminal in Soul Society. Beside this, Unohana still has a sense of honor. When she finally defeated by young Zaraki at her youth, she was surprised after she knows that he is stronger than her, believing that he will become next "Kenpachi" on his future. Even known as a criminal and being chosen to be a co-founder of Gotei 13, Unohana never tries to betray the Gotei 13 and shows her great loyalty toward the organization and also toward Captain Yamamoto.
Unohana never takes any grudge toward Kenpachi Zaraki even after he defeated her in the past. After returning to her "Yachiru Unohana" identity, she fights to the death with Zaraki in order to train his strength. She finally admits his strength for the last time with a warm smile before passing on. Just like her successor and most of shinigami in the eleventh division, Unohana enjoys fighting and killing her opponent. However, her methods are way more disturbing and clever than Zaraki's, by using her Kaidō (healing Kidō) knowledge, she can kill-and-heal her opponent so she can enjoy the battle longer.
Before her life as a Captain, Yachiru Unohana is known to be the most diabolical and notorious criminal in Soul Society. Later, Genryūsai Shigekuni Yamamoto comes to seek her to be one of the co-founders of Gotei 13 and become one of the 1st generations of 11th division captain, who known as "The 1st Kenpachi". At some point in the past, Unohana was taught medical techniques by Tenjirō Kirinji as a way of prolonging fights.
Sometime after becoming a captain, she undertook a mission to eliminate the warriors on the edges of Rukongai. Having lost interest in fighting, Unohana wandered from place to place in search of something that would please her sword and came across a young boy who would one day be known as Kenpachi Zaraki. Attacking her on sight, the boy was able to injure her, causing the woman to once again enjoy fighting. However, despite being the one left standing at the conclusion of their battle, she realized he was stronger and was better suited to become the future "Kenpachi".
After her fight with the young boy, she left the 11th division and become a 4th division captain under the new identity "Retsu Unohana" thanks to her Kaidō and medical techniques that she learns from Kirinji. 110 years ago before the current events, Unohana was also present of Kisuke Urahara's promotion as captain of 12nd division and in an emergency meeting of the missing of 9th division members. At some point, she has lieutenant named Seinosuke Yamada, who is Hanatarō Yamada's older brother. Unfortunately, due to his horrible attitude and because both she and the other 4th division members can't stand with it, she fired him and make Isane Kotetsu as his perfect successor.
The Return of the 1st Kenpachi
When Captain Kyōraku have met at Central 46, he states that he wanted to learn Kendō from Kenpachi Zaraki. However, the central 46 doesn't agree with Kyoraku's decision, so Kyoraku then calls forth Captain Retsu Unohana stating that he will leave Zaraki to her as she is the 1st Kenpachi. Central 46 give her permission to use lowest ground of Muken as their training ground so both Zaraki and herself can enjoy their fight as much as possible.
- Kenpachi Zaraki named his former young lieutenant, Yachiru Kusajishi was is come from Unohana real name. He named her "Yachiru" in memory of the Yachiru Unohana, the only person that he had ever admired.
- Her real name, Yachiru, means "Thousand Styles", "Eight thousand/many flows" or "Eight thousand/many exiles" , while her Retsu name means "fierce" or "violence". All of her Retsu and Yachiru name is refers for her true dark identity as the 1st "kenpachi", her former status as a criminal with a many knowledge about swordsmanship, and one of the most seniors member of Gotei 13.
- Before her true identity is revealed, it's shown that several members of the 11th division and her fellow captains fear of her and have some intimidating aura behind her gentle-persona. Possibility foreshadowed about Unohana true identity as "1st Kenpachi"
- After her death, Isane Kotetsu, her lieutenant become her successor as 4th division captain.
- Unohana is the only shinigami character whose Zanpakutō's Shikai and Bankai share the same name, but with different kanji and meaning.
- With Unohana being a captain, Yamamoto and the Soul Society possibly already forgave all her crimes due to her greatest loyalty to Gotei 13 and never tried or intended to betray them to join the main big-bads like Sōsuke Aizen and Yhwach.