Misaka 10039 (ミサカ10039号 Misaka Ichiman Sanjūkyū-gō?) is a Sister, a clone of Misaka Mikoto, that appears in Toaru Majutsu no Index. Originally supposed to be killed in the experiment against Accelerator as part of the Level 6 Shift Project, she is one of the few Sisters that remained in Academy City for readjustments.