Isane Kotetsu

Serving as the dedicated lieutenant of the 4th Division under Captain Retsu Unohana, this tall and observant Soul Reaper manages medical and supply relief within the Gotei 13. While she possesses a quiet, reserved nature, she shares a deep, fierce loyalty with her younger sister, Kiyone Kotetsu. She views Unohana as both a mentor and a maternal figure, though she secretly struggles with the burden of persistent, recurring nightmares that haunt her rest.