Sayu, Shuumatsuban's resident ninja, is obsessed with sleeping and growing taller. She has mastered all kinds of ninjutsu to run away and hide in pursuit of opportunities to laze around and sleep. A ninja from the Shuumatsuban is struggling with growing tall. Sayu believes that sleeping can help her growth, which is why she prefers to use her ninja techniques to hide and "laze around." and is extremely loyal to the organization. She is 16. (genshin impact)