TV-Series
Description
Index Librorum Prohibitorum, known almost exclusively as Index, is a central figure in her narrative. She is a fifteen-year-old nun belonging to Necessarius, the Church of England's specialized agency for dealing with magical threats. Her appearance is distinctive and consistent with her religious habit, as she is almost always seen in the Walking Church, a white robe with gold embroidery that originally served as a powerful protective garment. She has long silver hair and striking emerald-green eyes, and her small stature, recorded at 148 centimeters, contributes to her youthful and delicate appearance.
Index's primary function and the source of her significance is her mind. She possesses a perfect, photographic memory that allows her to instantaneously and permanently recall anything she sees or hears. This ability, combined with a natural immunity to the madness-inducing effects of grimoires, made her the perfect vessel for the Church. Implanted within her memory are 103,000 forbidden magical texts, the Index Librorum Prohibitorum, effectively making her a living, walking library of all forbidden magical knowledge. Her magic name is Dedicatus545, which translates to "The devoted lamb protects the knowledge of the strong," a phrase that encapsulates her purpose.
Despite containing a universe of magical knowledge, Index is unable to use magic of her own free will. This limitation is a deliberate restriction placed upon her. However, she has a built-in defensive system known as John's Pen, or "Automatic Writing." When Index is perceived to be in lethal danger, this system activates, overriding her personality and allowing her to draw upon the grimoires in her memory to cast extremely powerful, high-class magical attacks. These include devastating spells like St. George's Sanctuary and Dragon's Breath. John's Pen also has a byproduct called the Feather of Light, which would forcibly reset her memory if a manual erasure was not performed on schedule. Even without active spellcasting, her depth of knowledge is invaluable; she can almost instantly identify any magic she witnesses, understand its principles, and often determine a method to counter it, using techniques like Spell Intercept to disrupt an enemy's chanting.
Index's personality is a mixture of kind-hearted devotion and childish petulance. As a nun, she is generally gentle, polite, and compassionate, often forgiving those who have wronged her. She has a strong sense of duty and accepts her burdensome role with a smile. However, this placid nature shifts dramatically in her day-to-day life, particularly around her closest companion, Toma Kamijo. With him, she is selfish, hypocritical, and quick to anger, often jumping to conclusions without understanding the full situation. Her trademark behavior when annoyed is to bite Toma on the head, a regular source of confusion and exasperation for him. She also has an enormous, almost insatiable appetite, which frequently becomes a point of contention regarding Toma's limited budget. Her curiosity about the world, especially modern technology in Academy City, is boundless, though she is often ignorant and confused by it, sometimes mistaking it for magic.
Her most important relationship is with Toma Kamijo, which forms the emotional core of her story. When she first fled to Academy City, she was being pursued by her former allies, Stiyl Magnus and Kaori Kanzaki, who were attempting to force her to undergo her annual memory erasure. Toma took her in and, using his Imagine Breaker, destroyed the magical "collar" in her mind that necessitated the erasures, freeing her from the cycle of losing all personal memories every year. This act of salvation is why she stays by his side. She harbors deep feelings of love and trust for him, having once confessed her affection, and she is deeply protective of him. This devotion also creates a minor rivalry with Misaka Mikoto, another girl with feelings for Toma. Her other key relationships are with Stiyl and Kanzaki, her former partners from Necessarius. Due to her repeated memory wipes, she had forgotten them, but she now considers them comrades, even though their shared history is complex and painful. She also forms a close friendship with Hyoka Kazakiri, who becomes her first real friend outside of Toma's immediate circle.
Over the course of the story, Index's role evolves beyond that of a damsel in distress or a simple repository of knowledge. While Toma and others often try to keep her out of dangerous conflicts to protect her, she consistently insists on being involved, using her expertise to analyze magical phenomena and provide crucial support. She experiences significant moments of personal agency and power, most notably when the villain Fiamma of the Right forcibly reactivates her John's Pen system, causing her to go on a rampage and manifest powerful angelic wings that easily overpower the magician Stiyl Magnus. During this event, she also learns the bitter truth that Toma lost his memories long ago and was hiding it from her, a revelation that sends her into a state of emotional and magical turmoil. Despite the betrayals and hardships, she chooses to forgive him. Her development is marked by a gradual integration of her past and present, breaking the cycle of isolation that the Church had imposed on her. She transitions from a tool who was reset annually to a permanent individual with continuous memories, forging her own path and loyalties while remaining the irreplaceable heart of the magical side of her world.
Index's primary function and the source of her significance is her mind. She possesses a perfect, photographic memory that allows her to instantaneously and permanently recall anything she sees or hears. This ability, combined with a natural immunity to the madness-inducing effects of grimoires, made her the perfect vessel for the Church. Implanted within her memory are 103,000 forbidden magical texts, the Index Librorum Prohibitorum, effectively making her a living, walking library of all forbidden magical knowledge. Her magic name is Dedicatus545, which translates to "The devoted lamb protects the knowledge of the strong," a phrase that encapsulates her purpose.
Despite containing a universe of magical knowledge, Index is unable to use magic of her own free will. This limitation is a deliberate restriction placed upon her. However, she has a built-in defensive system known as John's Pen, or "Automatic Writing." When Index is perceived to be in lethal danger, this system activates, overriding her personality and allowing her to draw upon the grimoires in her memory to cast extremely powerful, high-class magical attacks. These include devastating spells like St. George's Sanctuary and Dragon's Breath. John's Pen also has a byproduct called the Feather of Light, which would forcibly reset her memory if a manual erasure was not performed on schedule. Even without active spellcasting, her depth of knowledge is invaluable; she can almost instantly identify any magic she witnesses, understand its principles, and often determine a method to counter it, using techniques like Spell Intercept to disrupt an enemy's chanting.
Index's personality is a mixture of kind-hearted devotion and childish petulance. As a nun, she is generally gentle, polite, and compassionate, often forgiving those who have wronged her. She has a strong sense of duty and accepts her burdensome role with a smile. However, this placid nature shifts dramatically in her day-to-day life, particularly around her closest companion, Toma Kamijo. With him, she is selfish, hypocritical, and quick to anger, often jumping to conclusions without understanding the full situation. Her trademark behavior when annoyed is to bite Toma on the head, a regular source of confusion and exasperation for him. She also has an enormous, almost insatiable appetite, which frequently becomes a point of contention regarding Toma's limited budget. Her curiosity about the world, especially modern technology in Academy City, is boundless, though she is often ignorant and confused by it, sometimes mistaking it for magic.
Her most important relationship is with Toma Kamijo, which forms the emotional core of her story. When she first fled to Academy City, she was being pursued by her former allies, Stiyl Magnus and Kaori Kanzaki, who were attempting to force her to undergo her annual memory erasure. Toma took her in and, using his Imagine Breaker, destroyed the magical "collar" in her mind that necessitated the erasures, freeing her from the cycle of losing all personal memories every year. This act of salvation is why she stays by his side. She harbors deep feelings of love and trust for him, having once confessed her affection, and she is deeply protective of him. This devotion also creates a minor rivalry with Misaka Mikoto, another girl with feelings for Toma. Her other key relationships are with Stiyl and Kanzaki, her former partners from Necessarius. Due to her repeated memory wipes, she had forgotten them, but she now considers them comrades, even though their shared history is complex and painful. She also forms a close friendship with Hyoka Kazakiri, who becomes her first real friend outside of Toma's immediate circle.
Over the course of the story, Index's role evolves beyond that of a damsel in distress or a simple repository of knowledge. While Toma and others often try to keep her out of dangerous conflicts to protect her, she consistently insists on being involved, using her expertise to analyze magical phenomena and provide crucial support. She experiences significant moments of personal agency and power, most notably when the villain Fiamma of the Right forcibly reactivates her John's Pen system, causing her to go on a rampage and manifest powerful angelic wings that easily overpower the magician Stiyl Magnus. During this event, she also learns the bitter truth that Toma lost his memories long ago and was hiding it from her, a revelation that sends her into a state of emotional and magical turmoil. Despite the betrayals and hardships, she chooses to forgive him. Her development is marked by a gradual integration of her past and present, breaking the cycle of isolation that the Church had imposed on her. She transitions from a tool who was reset annually to a permanent individual with continuous memories, forging her own path and loyalties while remaining the irreplaceable heart of the magical side of her world.