Carmilla

The Secret of the First Extermination: Carmilla was the first being in Hell to successfully kill a Destroyer Angel. She did so during a purge, protecting her daughters. She hid this fact for a long time, fearing that if Heaven learned of the possibility of her destruction, they would unleash their full might upon Hell.
Fighting Style: Her fighting style is based on martial ballet. She is incredibly fast, flexible, and delivers deadly kicks using her pointe-bladed shoes.
Mentorship: In the song "Respectless," she clashes with Velvet, and later, in a duet with Vaggie, "Out For Love," Carmilla reveals an important secret: in battle, you can't rely solely on blind rage. To defeat angels, you must fight to protect those you love. She helps Vaggie regain her fighting form and trains her for the final battle.

Calculation and intelligence: She doesn't seek out pointless conflicts and prefers to resolve issues through diplomacy and trade. She has enormous authority among the other Overlords (even the impulsive Beelzebub and the arrogant Alastor treat her with respect or at least defer to her).
Motherly Love: This is her most important trait and vulnerability. Carmilla loves her daughters, Odette and Clara, madly. Everything she does (including her business and status) is aimed at protecting them.
Secrecy: She prefers to keep her cards close to her chest and not reveal her power unless absolutely necessary.

Carmilla looks incredibly elegant, graceful, and at the same time menacing. Her look combines elements of high fashion and combat readiness:
Figure and height: She is very tall, stately, with grayish-white skin and long white hair with black strands, gathered into a huge bun, resembling horns or a crown.
Eyes: She has expressive eyes with black whites and bright pink irises.
Clothing: Carmilla wears a strict yet elegant ballet dress in black and white with high collars.
Key detail: Her shoes are modified ballet pointes with angel steel blades on the toes. She often hides her long arms behind her back or holds them in graceful gestures.