Annie Leonhart

Background
Annie had trained with her father since she was young. From the Trost District in Wall Rose, she is considered a soliditary, stoic type and soliditary doesn't come easily. In Ch.33, her father begs for forgiveness for the way he trained her. Thinking it may be too late, he tells Annie to treat everyone as her enemy and she promises to come home to him. Upon graduation from four years of military training, Annie ranked 4th.

Current Plot
Placing a rank below Bertholdt Fubar, Annie will enlist in the Military Police. When the Colossal Titan breached Wall Rose, the same way it did with Wall Maria, Annie was assigned to rear guard with Mikasa and a few of the others to help fend off the Titans as the people evacuated to the safety of Wall Shina. She was involved in helping Jean Kirschtein and the other retake back the supply unit and restocking their gas tanks. While watching Titan Eren fight off the other titans, Annie overhears Jean and Reiner arguing and she think that he may be their ally. She learns about Eren's shapeshifting ability.

In Ch.17 during the hand-to-hand combat training, Annie easily beaten Eren and Reiner with a kicking technique her father taught her. Later on during dinner, she watched as he used the same technique to subdue Jean when he tried to pick a fight again. The next day, Annie and Eren were watching him as he practice hand-to-hand combat. She noticed that Jean's only taking it seriously just to pick a fight again and doesn't see anything positive from it. Annie points out something wrong in how Eren handled the kicking technique and offers to teach it to him the proper way.

Soon the two titans captured for research were killed and the Military Police were checking the Three Dimensional Maneuver Gears from the trainees. During that time, Armin, Annie and Conny Springer were talking about which division branch they want to go into. When Annie reveals that she will go to the military police, Conny considers joining them too and asks her about what she thinks. She only tells him that it's his decision to make, not hers. Annie soon asks Armin what he would do if he was told to die when she learns he'll join the Scouting Legion. He tells her if the reasons are good, then he'll do so. Annie thinks he's weak physically, but yet he's very strong at heart. She then produces Marco's 3DMG as her own, prompting Armin to be suspicious. While the Scouting Legion are searching for new members, Annie leaves to join the military police.

Arc 2: Annie VS Mikasa.
In Chapter 31, Annie awakens in her room in the Stohess District of Wall Shina. Her hair is the same as the Female Titan's when not tied up in a bun. Annie is teased by Hitch and Marlo, but a member tells them to leave her alone believing that she hasn't recovered from battle and is the only one who has real combat experience. Soon Armin approaches her and asks for help in hiding Eren until they can convince the king to protect the walls better. Annie reluctantly agrees by putting on her father's ring and escorts them to a place where they can hide. When Eren and Armin tried to get her to go down an underground passageway with them, she refuses and suspects something is awry. Mikasa, having enough of Annie's games, takes off her hood and draws out her 3DMG. She refers to her as the female type titan. Armin's suspicion is confirmed when she smiles in the same way as the female titan, and by her refusal to enter the passage, where she cannot transform.

In Ch.32, After firing the signal, some people in the town comes out of their hiding place and tries to restrain Annie. As they struggled to restrain her, she manages to injure herself by using a blade hidden in her father's ring. Annie transforms into her titan form and kills the people who tried to restrain her. Trying to capture Eren, Armin and Mikasa realizes how desperate she is and try to get him to fight her. Overcoming his initial shock at the identity of the female titan, he takes Annie on and transforms into his titan form.

In Ch.33, As Eren tries to hold Annie off from escaping, Mikasa realises that she may be the only one who can stop her. Knowing that she may try to climb the wall to get out of Wall Shina, she trails Annie. Annie decides to fight and defeat Eren again. After that, she continues to try and escape. However, by that time, Mikasa had already caught up to her climbing the wall. Not hesitating in the slightest, she cuts off all of Titan Annie's fingers, leaving her to struggle to hold on. Mikasa then tells her to fall down and pushes her off via the head. Eren in his titan form hold down the body as both the military police and the members of the Scouting Legion, cut into the flesh and tries to extract Annie from it.

In Ch.34, Annie is trapped inside a crystal, while one of the Scouting Legion members tries to break the crystal to extract her, but Hanji stops him and tells both the Military Police and the rest of the Scouting Legion to take her underground and detain her. Meanwhile, Jean who went into the town supposedly posing as Eren learns the truth about Annie being the female titan.

Abilities:
Annie is one of the strongest fighters aside Mikasa and Eren. She learned her techniques when she was a child and her father trained her relentlessly. One such move was a kicking technique that she used to defeat Eren and Reiner during training. She would later teach the move to Eren when she tells him about what he did wrong and he didn't need to hold back.

Titan Shifting
Like Eren, Annie displays an ability to transform into a 15 meter titan. She uses this form to wipe out military formations the Scouting Legion uses during their attempt to retake Wall Maria. Annie's titan form is similar to Eren's form, but more feminine and muscular.

It is a mystery how Annie actually managed to know the secrets of transforming into a titan. She is more adept in using her titan form than Eren. In her titan form she is able to selectively regenerate certain parts quickly as opposed to automatic simultaneous regeneration of all the damaged parts. She is able selectively harden parts of her skin to protect it from damage or to enhance attack. Annie is desparate to kidnap Eren and reasons for that remains unknown.