Hatohara is a young woman with chin-length messy black hair and black eyes with white pupils. She also has freckles under her eyes and on the bridge of her nose. She has been seen wearing a light-colored t-shirt under a jacket. Ninomiya described her as a dull woman with a fake smile.
When in combat, she wears her unit's uniform, a black full-body suit, including a black vest, a grey necktie and grey loafers, giving her an androgynous appearance.
Not much is known about Hatohara's personality. Ninomiya considered her as an idiot, being unable to orchestrate a plan such as what happened on the day she disappeared.Ema, on the other hand, spoke of her fondly, stating she would never shoot a person; but was an expert at disarming them. She seemingly considered herself useless.
Yuzuru Ema: She has a close teacher-student relationship with Ema as she is quite open when she is with him, often apologizing for her incompetence.
Masataka Ninomiya: She has a strained relationship with her former leader, mostly due to her inability to directly shoot the opponent. Their relationship worsens after she broke Border's rules by giving triggers to civilians, which demoted her unit to B-rank.