Height 148 cm (4'10") Classification Magician Affiliation Anglican Church Ability Spell Intercept Index, also known by her full name Index Librorum Prohibitorum, is one of the main heroines and the titular character of the series. She is a young nun from Necessarius, a branch of the Church of England. Index is small in stature and has a petite build. About 14 or 15 years old, she has thigh-length, silvery-blue hair with very white skin and large green eyes. She also wears a white robe with golden embroidery sewed onto every edge of it, the Walking Church.