The older of the two twin maids in the Tohno mansion, Kohaku, along with Hisui, is a childhood friend of Shiki. She wears a Japanese kimono and is always seen to be smiling and cheerful, being especially gifted with medicine. Her name, Kohaku, is the Japanese word for amber, referring to her eye color.

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She hides her tragic past behind a cheerful face and Hisui's cold demeanor. Like Hisui, Kohaku is a Synchronizer, a person that can give someone life energy through exchange of body fluids.

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Kohaku was a member of a branch family of the Fujou clan, but was brought with her sister Hisui to live in the Tohno mansion, because the Fujou clan had a special power of giving others energy. Makihisa Tohno needed this ability in order to keep control of his body.