Miche Zacharius is a third-year student at Attack Junior High School, appearing throughout the spin-off series. He actively participates as a member of the Scout Regiment club. His distinctive appearance features blond hair with bangs completely covering his eyes, a thin mustache, stubble, faint sideburns, and a frequent green hoodie worn over his uniform, giving him an older look.

Quiet and reserved, Miche rarely speaks. He possesses a highly sensitive sense of smell, habitually sniffing people upon meeting them; their scents often cause him to smirk or sob, a behavior notably displayed during club recruitment. He is germophobic, avoiding food not prepared by his parents or relatives. This fear initially stopped him from eating dishes by cooking club members Nanaba and Gelgar, though he eventually overcame his reluctance after tasting Nanaba's rice ball, reconciling with them.

Miche engages in numerous school events: observing the first-year entrance ceremony, competing on Sports Day (teaming with Levi), attending the Scouts' "Test of Courage" night, participating in student council elections, and joining biology club sessions led by Hange Zoë. During the school festival, he disguised himself in a band with Levi and Hange to distract Titans surrounding first-years in the principal's office.

He respects Hange Zoë despite their eccentricity, serving as one of three heads of the Survey Club alongside them and Levi. His bond with Nanaba strengthened after confronting his germophobia. He aids Hange on bug-collecting trips, using his sense of smell to locate insects, and competed against first-year students during a club rivalry, admiring Reiner Braun's tactics before overpowering the group. Notably, Miche appears in nearly every episode but never speaks any dialogue.