He was a man of average height and light hair, which was shown to be light grayish in anime. Which was covering his forehead in the form of bangs, ending right above eyes. His eyes were dark blue. He looked somewhat older and wiser than Eren. He was shown to be wearing the standard trainee uniform.
Mylius Zeramuski is a graduate of the 104th Trainees Squad. After the second attack of the Colossal Titan, he is assigned to the middle guard along with Eren Yeager and Armin Arlert. Shortly after the squad's deployment, the group is attacked by an aberrant Titan, which results in the death of Thomas Wagner. This causes Eren to attack the aberrant in a rage. Mylius warns Eren not to go alone, which in turn causes his squad to pursue and try to help him. Mylius is then eaten by a Titan when the squad engages the Titans in the Trost District.