Index

also known by her full name Index Librorum Prohibitorum ("List of Prohibited Books"), is one of the main heroines and the titular character of the series. She is a young nun from Necessarius (必要悪の教会 Hitsuyōaku no Kyōkai^?, "Church of Necessary Evil"), 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, that prevents any injury on her, but it is later destroyed by Tōma when he touched it with his right hand, which is why her uniform is stitched with golden pins. Her mind has been implanted with the 103,000 magical texts of the Index-Librorum-Prohibitorum as she possesses Photographic memory, which makes magicians wonder if she really is human because just one grimoire is poisonous to the mind, and one is more than enough to kill a person without the proper preparative.

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