Sato had violet eyes and long, dark-green, wavy hair that reached past her shoulders. She wore the Reserve Course uniform, which consisted of a long-sleeved dress shirt, a red necktie, a black-pleated skirt, and brown shoes with matching socks. According to her reasons to why she had killed Natsumi, she was a heavily possessive and defensive person who would do anything to protect her friends, especially Mahiru Koizumi, from being hurt.