retsu unohana
Retsu Unohana

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Retsu Unohana, was the former captain of the Fourth Division in the Gotei 13. She was one of the oldest and most experienced captains, and was Soul Society's best healer. Her lieutenant was Isane Kotetsu. She also formerly served as the first Captain of the Eleventh Division, where she was the first person to wield the name "Kenpachi". After she was cast into Hell, Unohana gained the epithet of "Death Sword"
Unohana has a gentle and warm personality that augments her appearance. Unohana is a soft-spoken, polite, and caring woman who uses honorifics when addressing everyone, including her subordinates and the enemy. She rarely shows any signs of panic or distress, and has a great sense of duty, shown in the times that she orders Hanatarō Yamada’s imprisonment and Isane Kotetsu’s chasing of Renji Abarai when he runs away with Rukia Kuchiki. Despite her sense of duty, she will also heal almost anybody around her, including Renji after he was defeated by his captain, Gantenbainne Mosqueda when she arrived in Hueco Mundo, and the Visored, referring to them as allies despite Shinji Hirako's reluctance to do so. With her grace and kind manners, she lets others know quietly that while she may be soft, she is not to be taken lightly. Despite her gentle nature, several members of the Eleventh Division and even her fellow Captains fear her.
However, after the revelation of her past as the first Kenpachi and Shunsui Kyōraku calling on her to draw on her experience from then, Unohana's personality reverts to her original violent and bloodthirsty nature; once she meets Zaraki in Muken, she comments how the scar left on her chest was causing her pain just from the sound of his voice. Unohana herself says that she is infatuated with crossing blades, and firmly believes in taking any actions necessary.