Kokoa Shuzen

Kokoa Shuzen (朱染 心愛, Shuzen Kokoa) (Koko Shuzen and Koko in the English translated manga by the Shonen Jump Manga company) is the younger half-sister of Moka Akashiya and the second sister of the Shuzen Family. She arrives as a first-year student to Yōkai Academy. Like her sister, Kokoa is also a Vampire, but her powers are not sealed. Being younger, Kokoa is not as strong as the 'sealed' Inner Moka, but uses a Transformer Bat, named Kou (also named Koumori Nazo and Kou-Buddy (Kou-buddy being the English dub version of "Kō-chan")) to make herself more formidable.