Ena Sakura serves as the faculty advisor for the Survival Game Club at her school, where she also works as a mathematics teacher. Her given name, Ena, was specifically assigned to her character when the manga was adapted into an anime. Physically, she is an adult woman with brown hair that reaches her neck and orange eyes, and she is often depicted wearing a hairband.

Personality-wise, Ena is defined by her extreme clumsiness and remarkably bad luck, though she remains completely oblivious to these traits. Her behavior is that of an unconscious troublemaker; she frequently causes accidents, makes mistakes, and finds herself caught up in various disasters that often result in injuries serious enough to require her to take leave from work. This has earned her a reputation among the club members as a bringer of calamity, and she is known within the group by the nickname the storm-summoning woman teacher. The members of the Survival Game Club find her to be a nuisance and treat her as a plague, as she often brings troublesome situations into their club activities.

Within the story, her primary role is that of the staff advisor for the Survival Game Club, meaning she is the supervising teacher responsible for the group. In the early parts of the original manga, she was once seen dressed in survival game gear alongside the club president, Mio Otori, but she rarely, if ever, actually participates in the mock gun battles that define the club's main activity. Information regarding her specific motivations, detailed key relationships beyond her general dynamic with the club members, significant character development, or notable abilities related to survival games is not available.