Daiyousei is a minor fairy character from the Touhou Project series, most closely associated with the area around the Misty Lake and the Scarlet Devil Mansion. She is usually portrayed as a friendly, gentle, blue-haired fairy who appears alongside Cirno in fan works and some official appearances. In the series, she functions more as a background character than a major plot figure, helping to enrich Gensokyo’s fairy population and atmosphere rather than driving the main story.