Eren was a young man of average height and muscular build. His facial features strongly resembled his mother's; he had a reasonably long, rounded face and sizable, expressive, gray eyes. His hair was short and black, and his bangs fell in a natural, middle-parted, curtain-type style. After his training and during his time as a soldier, he became very physically fit and muscular, although this was often unseen due to his relatively baggy clothing. After the four-year time skip, Eren grew his hair down to his neck.
By the time Eren infiltrates Marley in the year 854, Eren had grown visibly taller, and his hair has grown down to shoulder length. He had a slight mustache and goatee, as well as bandages that cover his forehead and left eye. To maintain his cover, he wore the Eldian armband around his left arm, though he had initially worn the armband around his right arm before it got corrected by Falco Grice. After returning to Paradis Island, Eren discarded his Survey Corps attire and began wearing a white shirt with dark pants underneath a simple black mantle. He tied his hair back into a bun and shaved off his mustache and goatee.
Eren is hard-headed, brash, and above all else determined. Ever since he was a child he was devoted to joining the Survey Corps no matter what. He is full of rage and in his titan form, it increases even more so.
Eren cared deeply for his friends and family, risking harm and even death in order to protect them. As a child, he took on larger boys who bullied Armin Arlert, and, more tragically, he attempted to lift the rubble that crushed his mother during the Titans' assault in Shiganshina. Eren was also capable of displaying violent behavior in defense of people he did not even know. This was highlighted when he attempted to rescue Mikasa Ackerman by brutally slaughtering two of the human traffickers who had captured her.
Powers and Abilities
As a soldier, Eren has been trained in hand-to-hand combat and three-dimensional Maneuvering Gear (used for fighting Titans). Due to his Titan Shifting abilities, he possesses an impressive healing factor that allows him to regrow severed limbs.
Eren also possesses the power of two of the nine legendary Titan Shifters, "The Assault Titan" and "The Original Titan". In his Titan form, he can lift boulders weighing several tons, harden his body, boasts an impressive healing factor, and exhibits the power to control all Titans with the power of the Original Titan. However, to use the final ability, Eren has to Sync-up with a member of the Royal Family to do so.