Petra Ral

Petra Ral (ペトラ・ラル) was a hand-picked soldier from the Scouting Legion by Corporal Levi in the Special Operations Squad. She was subsequently killed off by the Female Titan when the attempt of an ambush backfired.

Personality
She looks up to Levi as a captain and cares strongly for her team, though notably at odds with Auruo.

Petra is kind and caring, as shown when she looks after and guides Eren when he is first admitted to the squad and seems to have acted as some sort of attachment figure for Eren among Levis Squad as she is the one shown to worry most about him as well as wishing he would rely and trust her and the others, and it is ultimately her who had managed Eren to do so.Whatever the case, Petras words had a major impact on Eren. It should also be of note that the biggest reaction from Eren over the deaths of the Squad was in regards to her.

She also showed the most remorse over the reaction of Erens accidental transformation.

Petra: "We're sorry Eren.We got scared and did something stupid and you must be disappointed in us."

Along with her comrades, she had bit her hand just like Eren, signifying that they had established a bond which was proven as very strong as Eren was shown to have been deeply hurt over their deaths and blaming himself for it.

Story
Petra is first introduced during an expedition outside Wall Rose, tending to a mortally wounded soldier. When she was unable to stop the bleeding, she helped Levi comfort the dying youth and wept openly at his death.

She is later selected to become a member of the Special Operations Squad and ordered to guard Eren Yeager. It is established that she greatly admires Levi, and argues frequently with Auruo Bossard over his imitation of their commander and his harsh behavior.

While initially wary of Eren and quick to draw her swords when he transformed by accident, she readily accepts him afterwards. She is the first of the group to bite her hand in imitation of Eren's method of transforming, and notes that doing so is actually quite painful. She serves as a gentle, almost maternal presence within the squad and discusses with Eren the importance of trusting one's comrades completely.

When the Female Titan begins her attack on the 57th Expedition, Petra is one of those most vocal about Eren avoiding battle. She repeatedly begs him to trust in his commanders and comrades, and accept the sacrifices of others so that the mission can continue. Eren eventually makes the decision to follow her advice, allowing the Scouting Legion to successfully capture the Female Titan in a trap. Afterwards, the Special Operations Squad is ordered to standby while efforts are made to capture the human within the Female Titan. However, the operation ends in failure when the Female Titan uses a scream to summon other Titans to her position and is devoured by them.

Afterwards, the squad begins to retreat back to their horses, when a flare leads them off-course. They are then ambushed by a person later revealed to be Annie Leonhardt, who murders Gunter Shulz before transforming back into her Titan form. Eren is ordered to flee while the surviving squad members engage the Titan in battle. Petra and the others initially seem to have the upper hand, first blinding the Female Titan before crippling both her arms. But when Petra and Erd Gin move in for the kill, the Titan suddenly regenerates a single eye and kills Erd.

Death
Paralyzed from the shock, and despite Auruo's pleas, Petra is unable to react in time to the Titan's attack, which breaks her spine and splatters her against a tree. Levi would later come across her corpse, and unlike the other members of his squad, would halt his advance for a moment to silently mourn her.

Abilities
She was a skilled and experienced warrior and had a high kill record of Titan kills (58 Titan killed, 48 in team and 10 in solo), being the highest currently known in the series so far.

Trivia

 * Petra is the only female in the Special Operations Squad led by Levi.
 * Upon returning from the failed ambush that cost Petra her life, Levi encounters her father. It is revealed she wrote to him constantly, and may have had feelings for Levi. He expresses his desire to see his daughter settle down and marry soon, but frets that she is still so young.