Caren Ortensia is an individual associated with the Church and serves as a priestess. Despite not being formally affiliated with the Burial Agency, she was observed assisting them due to her unique abilities in a short story from the Character Material. Her unwavering compassion and benevolence drive her purpose in life, which involves helping others even at personal cost. When confronted with wrongdoing, Caren does not assign blame to individuals but rather attributes it to malevolent forces that compelled them to act negatively. If she ever makes a mistake, she seeks forgiveness from God instead of the offended party.
One of Caren's distinctive traits is her love for teasing and exploiting others' emotional vulnerabilities. Upon identifying an individual's sensitive spot, she takes pleasure in bringing it out in front of all the other characters, often causing outrage and embarrassment among them. Despite this behavior, Caren remains composed when confronted with criticism or opposition from Avenger. In fact, she responded by squeezing his face without showing any signs of discomfort or emotion.
In contrast to her priestly attire, Caren has chosen to wear a revealing costume that lacks a skirt for both practical and seductive purposes. Despite being affiliated with the Church, she is not deterred from pursuing her desires and remains committed to her mission of helping others.
Her father is Kotomine Kirei.