Ariel Quarta is a side character appearing in DxD Black Lamb. She is the leader of the angel division in Tokyo, japan and has the young angel named Castiel working as her second command who is her brave saint ace. She was once friends with Semyaza Jr. until the latter decided to become a fallen angel. Ariel is also the daughter of Griselda Quarta and her angel lover Akriel and has two younger twin siblings. She is described by Aurora to be the angel version of Ex Gremory IV due to having a powerful bloodline and . She repeatedly tries to control the criminal activity that Ex Gremory IV brings to Tokyo, by trying to control his illegal drug and gun selling. She also tries to break up the turf battles between Semyaza Jr. and Ex Gremory IV.