Ronova is the Ruler of Death and one of the Four Shades of the Heavenly Principles. The Frostmoon Scions know her by another name: Tuonetar. She's also called the Mother of the Underworld or Lady of the Underworld, titles that pretty much explain her domain.
She appears as a tall, curvaceous woman with pale skin, long thick white hair, and striking golden eyes marked by unusual flower-shaped pupils with seven petals.
Her aesthetic is distinctly gothic—she gravitates toward black, gray, and deep red. Her main outfit features a black translucent bodysuit under a strapless black dress with an open front skirt that shows off her legs. Two triquetras decorate each side of the skirt over a flowing gray translucent underskirt. The back of the dress transforms into black feathers lined with dark red, creating an almost wing-like effect.
She completes the look with black opera gloves, red eye-shaped hair ornaments on both sides, black high heels, a white transparent veil trailing from the back of her hair, and a pair of dark red wings that curve upward and feature eye-shaped cutouts—fitting accessories for the ruler of death itself.
Content compiled by AnimeList.moe from publicly available sources.