Haku Yumizuki (Yumizuki Haku) was the lieutenant of the 8th Division under Sakura Hyoji.
Haku keeps her long black hair in a ponytail, and has a youthful appearance. She has dark purple eyes and wears red dress which looks like a school uniform, and a skull-like clip on the left side of her head. She sometimes wear a purple short skirt kimono.
She was promoted as the new lieutenant of the 8th Division, and served under Captain Sakura Hyoji. Sometime later, she was demoted.