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Erwin goes with cleanly parted blond hair along with sideburns and a definition of thickness in his eyebrows. He can be seen wearing a complete dress suit with a green necktie; in more casual settings, he lacks the jacket and wears an emerald bolo tie instead.
As the teacher and faculty advisor of the Survey Club, Erwin is a generous and kind-hearted man, and almost everyone in the school looks up to him. He appears to be nice to everyone whether they are humans or Titans and is often seen helping the students or trying to solve problems peacefully. However, he admitted to the Survey Club that he actually hates Titans and showed ruthless behavior towards them. Erwin is also very strong, being able to defeat several Titans by himself.
Mr. Smith, at some point during his career at Attack Junior High, became the faculty advisor for the Survey Club.
Before the start of the current school year, Erwin encountered several future first year students, including Jean, Sasha and Connie; he was able to help each one, earning their respect. He would later encounter two Titans stealing snacks from a few students on campus; in an effort to defuse the situation, he does not reprimand them and even offers some of his own. This infuriates Eren, a new member of the Survey Club, and denounces him as unworthy of being head of the club. He later appears and formally introduces himself as the faculty advisor for the Survey Club and reveals he will be going with the Club on an overnight trip. After arriving at their lodge, Erwin notices that Eren has continued to badmouth him as a lousy teacher and should not be in charge of the Club; despite this, Erwin merely smiles and resolves to get Eren to like him just like the others do.