Aeng-du is a short young woman with pale skin and large black eyes. She wears her black hair long, with it reaching her ankles. Her forehead is obscured by a set of blunt, black bangs, with two strands resting just past her ears. She wears a red headband at all times, and two beads hold the end of her hair together: a smaller, red one on top, and a larger white one underneath it. She wears a deep navy hoodie emblazoned with the LCD logo on its left shoulder, over a white button-down with a red tie. Over her top, she wears a small black vest and an employee ID. At her waist, she wears a dark pleated skirt over a set of similarly colored slacks, her feet covered by leather boots. Her arms are replaced by a set of dark, highly augmented, prosthetic arms which are Detachable. She carries a Mook Workshop blade, notable for its black sheathe with a pale silver ornamentation. From its silver hilt, a red tassel hangs. Aeng-du is a deeply determined person, somebody who is willing to push herself through extreme situations for those she cares about, most especially to Guest. She has an unshakable determination even in hopeless situations, expressing the importance in trying her absolute best even if she expects to fail. However, she carries a deep-seated worry over her own position in society, exacerbated after being forced from the District she once called home. She shows a more casual side of her personality around her Mentor, readily chastising him over his laziness, frequently attacking him for his avoidant nature. Similarly, she acts exponentially more devout towards Guest, singing their praises at every possible moment in an attempt towards building up others' expectations of them. These are not entirely misplaced, as she truly cares for and trusts them, though she understands his divide in casualness being vastly different between those he trusts and outsiders. Despite Guest's status as her Mentor, she treats them more like an equal peer. Sometimes when Aeng-Du is Frustrated or out of emotional Distress, she detaches them to feel better or more normal like a human without machinery but doesn't require help reattaching them but other themselves she stress eats instead. She likes snacking and eating things that interests her.