Sayu is a small, sleepy ninja from the Shuumatsuban in Genshin Impact. She is known for her short stature, cat-like hood, and constant desire to sleep, often avoiding work whenever possible. Despite her lazy appearance, she is highly skilled in stealth and mobility, serving as a covert operative who gathers information and handles secret missions. She acts as a support character in the game, using Anemo abilities to heal, swirl elements, and move quickly across the field.