Carmilla is a tall and slender, light gray-skinned demon. She sports white ankle-length hair that has been formed in the shape of large horns by thin ribbons, with black streaks. Carmilla appears to be largely professional, though she can lose her temper, especially when Zestial is insulted or her family is in danger. Zestial claims that losing her temper is usually very unlike her, indicating that she is usually calm and level-headed.