Arisu Sakayanagi is a prominent character in the anime and light novel series 'Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e' (Classroom of the Elite). She is the leader of Class 1-A at Advanced Nurturing High School and is known for her extraordinary intelligence, strategic thinking, and calm demeanor. Despite her physical frailty, Arisu is a formidable rival who often orchestrates complex plans to secure her class's dominance, making her a key figure and a major antagonist within the series.