Lucy Yang is an elderly exorcist who serves as one of the four Arc Knights of the True Cross Order, a rank that represents the highest tier of exorcist achievement within the organization. She is a member of the Chinese branch and primarily works in surveillance. Physically, she is short and stout with light grey hair worn tied at medium length, dark eyes, and a wrinkled complexion. Her position as an Arc Knight implies exceptional competence in combat and demonology, and she has demonstrated her capabilities in the field. Before attaining the rank of Arc Knight, she was deployed during the occupation of Section 13 to combat members of the Baal. In the Beyond the Snow Saga and The Blue Night Saga, she appears as a supporting character, contributing to the Order’s operations during critical events. Her specific motivations and personal relationships are not elaborated in available sources, and her abilities beyond the general skills expected of a high-ranking exorcist are not detailed.