Koyuki Azumaya  

, 東谷 小雪

In Japan, Koyuki, a foreign kunoichi who recently arrived, develops feelings for Natsumi shortly after settling into her new home. She discovers Zeroro, an injured ninja she rescues from the wilderness, and teaches him the art of ninjutsu. After becoming a skilled ninja himself, he adopts the name Dororo. Koyuki relies on Natsumi to help her adapt to modern life in Japan. She frequently ties back her long hair with a bow and can transform into a ninja instantly. Despite having an impressive past as both a civilian and a ninja, Koyuki is known for her carefree, optimistic personality and strong bond with Natsumi. Her physical abilities are exceptional, rivaling even those of Natsumi, making her one of the most powerful characters in the series.