Armin Arlert

Physically the weakest of the trio and painfully aware of it, Armin compensates with a quick, analytical mind fed by forbidden books about the outside world - oceans, deserts, lands of ice. Prone to panic yet capable of astonishing composure, he conceives the plan to use Eren's Titan form to seal the breach at Trost and later helps expose the identity of the Female Titan.

The smallest and slightest of the three friends, with a narrow frame that the harness straps seem to swallow. He has pale blond hair cut in a blunt bowl shape that falls over his forehead and ears, and wide blue eyes that make him look younger and more startled than he is. His expressions carry most of his characterization: he is drawn flinching, calculating or wide-eyed with sudden understanding far more often than he is drawn angry. He wears the same cadet and Survey Corps uniform as the others, and the contrast between his physical slightness and the heavy steel blades he carries is deliberate and frequently emphasized.

Armin is anxious, self-critical and acutely aware that he is the physically weakest person in any room, which he repeatedly calls a burden on his friends. He is also the sharpest analyst among the cadets, able to read a battlefield in seconds and assemble a plan from scraps of information while everyone else is panicking. Curiosity is his defining drive: he wants to see the ocean and the world outside far more than he wants glory. He is gentle, honest and easily frightened, yet he has a stubborn moral spine, arguing for Eren in front of leveled rifles and volunteering for the most dangerous roles precisely because he does not believe his own life is worth more than anyone else's.

Armin grew up in Shiganshina as the grandson of an elderly man who raised him after his parents' deaths. The family owned contraband books describing oceans, mountains of fire, fields of ice and sand, and Armin shared them with Eren, seeding the obsession with the outside world that drove them both. He was frequently beaten by other children for insisting the Walls were not eternal, and Eren and Mikasa defended him. After Wall Maria fell, his grandfather was conscripted into the disastrous operation to retake the territory and never returned, leaving Armin alone with his two friends. He enlisted alongside them, bringing analytical ability rather than physical strength to the Training Corps.

1. The Fall of Shiganshina

   He survives the breach and the evacuation and loses his grandfather to the refugee conscription that follows. Living on rationed bread in the interior with Eren and Mikasa, he absorbs the lesson that the Walls offer no safety, and he enters the military with the two people who have always shielded him.

2. 104th Training Corps

   Physically outmatched at nearly every exercise, Armin compensates with theory and finishes within the top ten of his class. His weakness in hand-to-hand and his poor stamina are constant sources of shame, and his instructors note that his intelligence is the only reason he ranks where he does.

3. The Battle of Trost District

   His squad is destroyed and Eren is eaten in front of him, leaving him catatonic on a rooftop. He recovers, talks Mikasa back from the brink, and then devises the plan to use the Titan Eren has become to plug the breached gate. He also faces down the Garrison alone to keep his friends from being executed.

4. The 57th Expedition Beyond the Walls

   Riding in the formation, Armin is among the first to realize that the Female Titan is being controlled by a person and is deliberately searching for Eren. His deduction, and a tense encounter in which he talks his way out of being killed, gives command the information that shapes the trap in the forest.

5. Assault on Stohess

   Armin reasons out the identity of the Female Titan from small details and is the one who must state it aloud to people who do not want to hear it. He accompanies Eren into the capital, serves as the voice of the trap, and forces a confrontation that neither he nor his friends wanted.

Eren Yeager

Childhood friend

The person who first defended him from bullies and the one he gave a dream to. Armin's descriptions of the sea shaped Eren's ambitions, and Armin repeatedly stakes his own life on Eren's.

Mikasa Ackerman

Childhood friend

He is the only person able to pull her out of despair in Trost, and she in turn shields him physically. Their partnership balances his mind against her capability.

Armin's grandfather

Guardian

Raised him and owned the forbidden books that shaped his worldview. Sent out with the refugee expedition to retake Wall Maria, he never came home, and Armin blames the system rather than himself only with effort.

Erwin Smith

Commander

Recognizes Armin's mind and takes his deductions seriously despite his low rank and youth, giving him a central role in the operation to expose the Female Titan inside the capital.

• He shows Eren a forbidden book describing the ocean and the world beyond the Walls.
• He freezes in shock after watching Eren be swallowed during the Trost operation.
• He offers his own life to the Garrison while arguing for Eren's.
• He conceives the plan to seal the breached gate with a boulder.
• He deduces the identity of the Female Titan and states it in front of people who refuse to believe him.

• He is voiced in Japanese by Marina Inoue, a female performer, a common practice for young male characters.
• He graduated within the top ten of the 104th despite ranking near the bottom in physical categories.
• His grandfather's contraband books are the origin of the entire group's fixation on the outside world.
• He is the first character in the series to suspect that a Titan could be controlled by a human mind.
• His plan to seal the gate becomes humanity's first genuine victory against the Titans.

• Eren Yeager
• Mikasa Ackerman
• Levi
• Erwin Smith
• Hange Zoë
• Jean Kirstein

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