Lucnoca is an ancient dragon and one of the most powerful beings in the world of Ishura. She is known by the titles Lucnoca the Winter and Fuyu no Lucnoca. She is credited with introducing the concept of winter to the world, as her mastery of Thermal Arts allows her to manipulate low temperatures to such a degree that she can alter the global climate. Her chilling breath is capable of changing both climate and topography, and she can instantly end any life caught within its reach. Lucnoca is the only confirmed user of ice-based Word Arts in all of history. For several hundred years, she was acknowledged as the absolute strongest among the dragon race, which is itself the strongest race on the land. Her home is the Igania Ice Lake, a remote and harsh region far from the capital of Aureatia. Despite the extreme cold, the lake supports creatures such as silver bears, which serve as Lucnoca's food.

Lucnoca's role in the story is that of a formidable champion among the Shuras, the demigod-like beings who emerged after the demon king's death. She is a supporting character in the anime, appearing in the second season. She participates in the Sixways Exhibition, a tournament of champions, where she faces Alus the Star Runner in the second match. Her motivations and personality are not extensively detailed in available sources, but she is depicted as a being of immense and ancient power, indifferent to the affairs of the world except when directly challenged. Her key relationships include her confrontation with Alus the Star Runner, a wyvern rogue, in a battle that showcases her supreme cold-based abilities against his speed and legendary weapons. Development of her character is limited in the anime adaptation, as she remains a largely enigmatic and static force of nature. Her notable abilities include the manipulation of cold through Thermal Arts, the capacity to freeze vast areas, and the ability to shape the environment itself, making her one of the most dangerous Shuras in existence.