Kohaku (琥珀)

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.

In the Melty Blood series, she is voiced by Naoko Takano.

(Sources: Wikipedia, Kagetsu Tohya)