A small-statured girl who is described as skilled in combat, and a realist who tends to be a loner.[ch. 18][vol. 5:profile] During cadet training, she teaches Eren some of her melee skills that she learned from her father.[ep 4][vol. 4] Having placed fourth in her class,[ch. 2] she joins the Military Police,[ch. 3] where she is regarded as being the quiet girl.[vol. 8]

She is ultimately revealed to be the Female Titan (女型の巨人 Megata no Kyojin). As a 14-meter (46 ft) Titan with an unprecedented feminine body structure, she is able to harden her skin and regenerate during her fights.[ep 18][ep 20][ep 21][vol. 5,6]. She ambushes the 57th expedition to Wall Maria, destroying Levi's special operations squad, and captures Eren briefly.[vol. 7] However, she is outed during the Stohess District storyline as Armin has deduced her Titan identity and the killer of Titans Sonny and Bean after she had presented Marco's equipment at the interrogation.[ep 19][ep 23][vol. 8] Following her defeat, Annie encases herself in a crystalline substance to prevent further probing as to her motives, which came from her father's wishes to treat the world as their enemy.[ep 24][vol. 8] At Magic City Comic-Con 2015, Landa said that she used a low-pitched and emotionless voice in portraying Annie.