Ruri Tsukishiro, mother of Kohaku Tsukishiro, carries a name steeped in symbolism: her given name, Ruri (瑠璃), evokes the deep blue hues of lapis lazuli, while her surname, Tsukishiro, fuses the characters for "moon" (月) and "white" (白). Her appearance mirrors this duality, with vibrant violet hair contrasting vividly against her warm orange eyes.