9S YoRHa, also known as YoRHa No. 9 Type S, is a major character in the video game NieR: Automata. He is a Scanner-type android tasked with intelligence gathering and hacking missions. As the story progresses, 9S becomes the primary companion to the protagonist, 2B, and plays a crucial role in unraveling the mysteries behind the war between androids and machines. His curious, emotional nature sets him apart from other YoRHa units, making him a central figure in the game's narrative.