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Erwin is a large, tall man with smooth blond hair styled in an undercut and parted neatly to the left side of his head. He also has bright eyes, but an often stern expression and a strong jawline. He is often seen wearing the Survey Corps' uniform with a white button down underneath, and on missions, wears the Survey Corps' green cloak.
Erwin is a calm person who takes every news neutrally, whether it is bad or good, but has already been seen showing enthusiasm in Levi's skills. He is ingenious and is not afraid of standing against the majority's opinion. The progress of humanity means a lot to him and he is willing to do everything to win against Titans. Erwin also has a ruthless side, as he does not hesitate to use violence or manipulate his allies in order to get what he wants.
Interested in Levi's skills, an underground thug, Erwin leads a unit to find and recruit him. His squad chases him and his friends, with Mike and him trapping Levi. After they apprehend the trio, Erwin asks them where they got their equipment from and if Levi received military training. After getting no answer, Mike uses force to make Levi talk. Erwin asks him his name and, as the latter did not talk more, he threatens the life of the two others. After Levi finally speaks, Erwin offers him and his friends to join the Survey Corps so that they would not be arrested by the Military Police, which they accept.