Mike Zacharias is a third-year student at Attack Junior High School and a member of the school’s Survey Club, which serves as the parody equivalent of the Scout Regiment from the original series. In the anime version of Attack on Titan: Junior High, he has a prominent nose and blond hair with bangs that completely cover his eyes. In the manga adaptation, his appearance is slightly different: he is a fairly tall young man with small eyes, hair parted down the middle, and a slight beard and mustache. He is most often seen wearing a dark tracksuit or a dark shirt and pants.

His personality is depicted as quiet and calm. He rarely speaks much and tends to observe situations without drawing attention to himself. His most distinctive trait is his extremely sharp sense of smell, which he uses to assess people and environments. He has a habit of sniffing people when he meets them, making judgments based on the odors he detects. This ability is portrayed as a running gag and as a useful skill within the club’s activities.

As a member of the Survey Club, his role is that of an upperclassman who supports the younger students, though he does not take center stage in the story. His motivations are not explored deeply in this comedic spin-off, but he generally follows the club’s objectives alongside other senior members such as Levi and Hange. In terms of relationships, he interacts primarily with fellow third-year students and teachers, yet specific bonds are not highlighted. His development is minimal, as the show focuses on parody and slapstick situations rather than character growth.

His notable ability remains his enhanced olfactory sense, which is both a comedic element and, within the logic of the series, a practical tool for identifying hidden Titans or locating people. There is no indication of his original series combat prowess; instead, his sniffing habit is his defining characteristic in this lighter retelling.