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The Female Titan is one of the antagonists of Attack on Titan and revealed to be Annie Leonhart. A 14-meter tall Titan with a previously unheard of feminine body structure, encountered during the expedition to Wall Maria. She possesses obvious intelligence, extensive knowledge of hand-to-hand combat, and the ability to selectively regenerate or harden parts of her body during battle. Leading numerous other Deviant Titans, she attacks the expedition forces in search of Eren and attempts to kidnap him. She slaughters the forces sent to fight her, with only Levi, Mikasa, and Armin surviving direct contact with her.
It's possible that she, possibly along with Reiner Braun and Bertolt Hoover as well as people from her homeland, know more about true nature of titans, but unwilling to let Survey Corps know them as she killed Sonny and Bean, 2 captured titans.
Annie Leonhart is one of antagonists from the manga series Attack on Titan. She's a former member of the 104th Trainees Squad who later enrolled in the Military Police Brigade after their graduation and she's a quiet young girl.