The nurse of the Dark Tournament, she accepts bribes from teams to keep Hiei and Genkai from fighting. Her specialties including healing and creating barriers. At the end of the manga, Ruka forms the "Cult Trio" with Koto and Juri, the two hostesses of the Dark Tournament, and become widely popular on human television. She is revealed to have a crush on Jin. She is voiced by Chiharu Suzuka in the Japanese version and Laurie Steele in the English dub.