Retsu Unohana is a highly respected captain in the anime and manga series Bleach, serving as the Captain of the 4th Division in the Gotei 13. Known for her healing abilities, calm demeanor, and wisdom, she is often seen as gentle and nurturing. However, Unohana also harbors a dark and violent past, being one of the oldest and most powerful Soul Reapers. Her dual nature plays a crucial role in the development of other key characters and major story arcs.