Annie Leonhart is a graduate of the 104th Training Corps and former member of the Military Police Brigade. Her exceptional skill with swords and unarmed combat earned her the 4th rank, but she is noted to be a lone wolf that struggles to work with others.

She possesses the ability to transform into a Titan known as the Female Titan. Trained from an early age by her father, she is selected as one of Marley's Warriors. As the Female Titan, she serves as a major antagonist prior to her defeat, in which she crystallizes herself and is left in a comatose state. She is currently being held deep underground under the custody of the Survey Corps.