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Armin has blond hair and big swirly blue eyes. He typically wears the standard Cadet Corps uniform.
Armin is studious and does well in his classes. As well, he is quick-witted and decisive, knowing the best way out of problems. This also signifies that he is let off easily due to his good reputation as a student whenever he is causing trouble like looking at indecent books, therefore he blames his tendencies on his friends and they take the trouble. Armin is not open to admit to his subtly deviant behavior.