She is voiced by Orikasa Fumiko in the Tsukihime anime, by Wendee Lee in the English dub, and by Sakuma Kumi in Melty Blood. Ciel also makes an appearance in Kagetsu Tooya as Ciel Sensei, where she acts as a teacher to various Tsukihime characters, among them Neko Arc.
Her birthday is May 3rd. Her height is 165, weighs 52 kg with a blood type of O. Her three sizes are B85/W56/H88. She appears to be a teenager, but her true age is much older, and unknown.