Yuyuko Saigyouzi is a fictional character from Touhou Project, known as the elegant and mysterious ghost princess of Hakugyokurou. She is the ruler of the Netherworld and a central figure associated with death, spirits, and springtime cherry blossoms. Yuyuko is often portrayed as graceful, playful, and deceptively carefree, while possessing immense supernatural power. In the series, she serves as a major character who interacts frequently with Reimu, Yukari, and others, often driving events with her curiosity and whimsical nature.