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Mikoto Misaka is one of the series' main heroines in Toaru Majutsu no Index series and the protagonist of her side story, Toaru Kagaku no Railgun. A psychic user of Academy City, her powers are ranked Level 5, the highest rank for the most powerful psychic users, and she ranks as third-strongest out of the seven people who hold this rank in Academy City.

Source from Wikipeida