Hange Zoë is a third-year student at Attack Junior High School and co-leader of the Survey Club alongside Levi and Mike. They stand taller than most third-year students, with dark gray eyes and dark brown hair tied in a messy ponytail featuring shaggy bangs. Hange consistently wears a dark red tracksuit instead of the standard uniform, often layered over a sweater or short-sleeved shirt, paired with white school shoes and oval glasses.

Hange exhibits an eccentric and intensely energetic personality, channeling boundless passion into every project, particularly Titan research. This enthusiasm frequently overwhelms peers, especially during discussions of Titan-related findings like jars of expedition-collected toenail clippings. Despite friendliness, Hange displays stubborn resolve, often disregarding others' discomfort during their pursuits. Financial mismanagement is a recurring trait; Hange habitually spends all money on club equipment, leading to severe hunger and subsequent requests for food money from others. Prolonged food deprivation triggers short-tempered outbursts. Hange is also a hoarder, accumulating items others perceive as garbage in their dorm room and reacting with distress when these things are discarded.

Returning excitedly from an expedition, Hange seeks to recruit first-year students into the secret Survey Club, advising them to join other clubs as cover. They later pressure the new members to prioritize these cover club duties, warning that Levi will administer punishment for non-compliance. When Biology Club enrollment declines, Hange unsuccessfully attempts to recruit Eren, Mikasa, and Armin.

Hange's financial habits strain their childhood friendship with Levi. They persistently pester Levi for money after overspending on equipment, even resorting to betting on test scores. After receiving funds, Hange immediately spends them on more gear, later "repaying" Levi with Titan belly button lint, irritating him. During a conflict between upperclassmen and first-year students, Hange snatches a sweet bean bun from Sasha, citing ineligibility rules. This incident contributes to Eren challenging the upperclassmen, with Hange declaring the losers must dance with Titan students. Hange wins a bun-eating race against Sasha by starving beforehand, aiding the upperclassmen's victory.

At a summer festival, Hange rejects an invitation to join Petra, Oluo, Eld, and Gunther, insisting on a bug-collecting trip with Mike. They pressure the group into accompanying them, utilizing Mike's heightened sense of smell to locate insects. The group becomes lost in a forest after Mike detects a distracting man-made smell. Hange consumes discovered grilled eel and curry, leading to drowsiness. After Mike departs with Nanaba and Gelgar, Petra's father rescues the group.

Hange sets traps in the dormitories to deter burglars, later discovering Sasha, Jean, and Connie caught in them. They express sentimental attachment to the trapped items, perceived as garbage by others, and react with horror upon learning Levi disposed of these collections.

Hange maintains close relationships with fellow Survey Club leaders. Levi tolerates Hange's constant requests for money, reflecting a deep mutual respect. Mike is equally valued, particularly for his heightened senses aiding club activities.