Carmilla Carmine/Relationships

Odette & Clara
As shown, Carmilla has a close, loving relationship with her daughters. Odette and Clara themselves have shown to be very loyal to their mother and she in turn trusts them deeply, with the two having been shown to work under her in her business as Hell’s top arms dealer and handles many important tasks of the business for their mother. As shown where Odette collected leftover angelic weapons from previous Exterminations and she and Clara deliver their mother’s products to Sinner’s who purchase them.

Clara and Odette themselves also seemingly works in the capacity of being their mother’s personal assistants as well in business settings. As shown where they accompanied her to a meeting she arranged between fellow Overlords and assisted her in her presentation to discuss the reprocussions of the Extermination to Hell’s populace and the damage it did to the number of souls they have under their control and how to lessen the impact on their respective business’s.

Later, Carmilla’s love for them is further emphasized where she admitted to have even went as far as killing an Angel-Exorcist to protect them despite the reprocussions. Heavily implying that she killed the Angel when it attacked one of her daughters in her defense.

Velvette
Carmilla dislikes Velvette along with the other Vees. Velvette calls her a coward for not wanting to fight the Angels. While it's unclear if the two have met prior to this, they display a lack of respect for one another and each other's attitudes.

Alastor
Carmilla appears to be acquainted with Alastor, and their brief interaction implies the two have met before, likely in other meetings between Overlords. She expresses disinterest in the reasoning for Alastor's seven year absence, much to Alastor's irritation. She, like Zestial, displays no fear of Alastor.

Zestial
The two appear to be close friends, having an implied history together. This friendship goes even deeper than surface level, as Carmilla was willing reveal her killing of an Exorcist to him. In her song, Whatever It Takes, she also seems to imply that killing the Exorcist was also in an attempt to protect Zestial alongside her daughters, showing she cares enough about him to fear for his safety.