Sakuya Izayoi is a human character residing in the Scarlet Devil Mansion. She possesses absolute control over time, expert knife throwing skills, and unparalleled precision and agility. Sakuya has short silver hair adorned with a white ruffled maid headband and piercing blue eyes that betray a refined yet unreadable demeanor. Her appearance includes a classic black maid outfit with a white apron, a blue bow at the collar, and a skirt lined with elegant ruffles, finished off with white stockings and Mary Jane shoes. Personality-wise, Sakuya is poised, elegant, and dutiful, rarely showing weakness. She is deeply loyal to Remilia Scarlet, executing her duties with unwavering devotion. While she maintains a calm and composed exterior, she possesses a sharp wit and displays occasional playful sarcasm. Although she can be strict, she holds a certain grace even in battle. Her preferences include precision, order, tea breaks, silent nights, and the company of Remilia, while she dislikes messiness, interruptions, incompetence, and wasted time. Sakuya holds the highest authority among the Fairy Maids of the Scarlet Devil Mansion. Despite being human, her abilities are on par with powerful yōkai. Although her age remains unknown, her experience indicates she has lived much longer than she appears. The last thing one might see before time stops is the glint of her knife.