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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 wears a polo shirt and occasionally wears an emerald bolo tie as well.
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.
Early into his tenure as the advisor of the Survey Club, Erwin took a group of first year students on a trip along with fellow faculty member Nile Dok. After consoling a distressed Hange whose lunch was missing, Erwin follows Nile and discovers a large pile of lunches next to a group of Titan students. After hearing Nile will not discipline the Titans, Erwin goes and ruthlessly beats them for stealing from others.
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 later appears to formally introduce himself as the faculty advisor for the Survey Club. He reveals he will be going with the Club on an overnight trip inside the Titan forest. 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.