A shikigami and a faithful servant of Madara Yakou. She is not the only one of his shikigami; the other one is Teirei. Niko has a cheerful personality and deems herself a maiden. She expresses her feelings openly. Like, then others praise her, and sometimes even ask for praise. It is harder to deal with her than with Teirei. For some reason, she does not like Kyougetsu Keishirou and Sakuya.