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Eren was usually seen wearing a green shirt and a brown jacket. He had a fairly long, yet rounded face, and sizable, expressive green eyes. His eyebrows were sparse and often furrowed, which made him seem troubled or annoyed. His hair was short and dark brown, with his bangs that fell naturally into a middle-parted curtain-type style. His complexion also seemed somewhat tan.
Eren was always bent on joining the Survey Corps, despite having seen them come back all wounded. He always wanted to see what was beyond the Walls and had a pure hatred for those who disagreed with him.
Eren is mentioned by Annie Leonhart, whose mission consists in capturing him during the Expedition outside the Walls.
When Doctor Yeager visits Mikasa's mother for checkups, he brings Eren with him. Eren encourages Mikasa to explore the woods outside her home. As Mikasa becomes frightened of these woods, he tells her she lived like the chickens her family raises. After she starts crying, he reassures her that the woods are not dangerous. Soon after, they encounter a pack of wolves, eating three men. Her father later informs her these men were most likely slave traders.
Eren grows closer to Mikasa as his father visits every ten days. Mikasa wishes she could see him more, and her mother then becomes sick, urging Doctor Yeager to visit every five days. During Mikasa's visit to Shiganshina to deliver a hat, Eren is brutally attacked by two men when he hit one of them for insulting the Survey Corps. Eren does not visit Mikasa again, until her mother moves to Shiganshina to be closer to Doctor Yeager.
Eren works with Armin Arlert on an airplane so they could go outside the walls. He is killed when this airplane crashes.
- Mikasa Ackerman - Eren had had a strong relationship with Mikasa since he had saved her life from the kidnappers.