Yuri Frederick Egin
ユリ ・フレデリク・エギン
Yuri Egin is the daughter of the Candial and Yukio and Rin’s Mother.
She has so far only been shown and named in the anime.
Yuri let herself voluntarily be possessed by Satan and give birth to his children to prove that humans and demons could live and love together. She died after she gave birth to Rin and Yukio.