Misaka Imouto is one of the many Sisters, or clones, of Mikoto Misaka in the series To Aru Majutsu no Index. Created as part of the Level 6 Shift Project, Misaka Imouto is designated as 'Sister' and has a subdued personality, speaking in a monotone and referring to herself in third person. Despite being mass-produced, she develops her own identity and forms unique relationships, particularly with protagonists like Accelerator and Touma Kamijou, playing an essential role in several story arcs.