Hotaru is a young woman who appears in the early episodes of The Fire Hunter. Her primary role is that of a bride being transported on a collection truck to a distant village. Her purpose in the story is tied directly to her village's belief that marrying her off will lift a curse that afflicts her home. This practice of sending young women away for marriage is a known custom in the harsh world of the series, and Hotaru is one of several brides making this journey, including Benio and the more resistant Kaho.

In terms of personality, Hotaru is presented as a gentle and resigned soul. Unlike Kaho, who openly rebels against her fate and looks for any opportunity to flee, Hotaru accepts her situation. She does not express a desire to escape the arranged marriage. Instead, she chooses to find solace in the positive aspects of her journey. She mentions that she never particularly wanted to be married off, but she considers it a blessing that the situation allowed her to meet her companions on the truck, such as the protagonist Touko and her fellow bride Benio. This outlook reveals a character who is kind-hearted, thoughtful, and able to find light in a difficult and predetermined circumstance.

Hotaru's role in the story is that of a supporting character who helps establish the setting and its social norms. She is one of the first friendly faces Touko encounters on the collection truck, treating the younger girl with kindness. Her willingness to cooperate contrasts directly with Kaho's desperation, highlighting the limited and oppressive options available to women in this post-apocalyptic world. Her key relationships are primarily with the other brides. She shares a car with Benio and Kaho, and she is shown to be on good terms with the female crew members aboard the truck, one of whom gifts her an elegant hairpin as a parting gift. This gift suggests she is well-liked and that her gentle nature has earned her respect.

Her development is limited as she is a minor character whose arc concludes when she reaches her destination. She leaves the truck and the story when she is delivered to her new village to be married. Her final scene shows her dressed and made up in fine clothes, a visual representation of her transition from one life to the next. She does not display any notable extraordinary abilities or combat skills, as she is portrayed as a civilian passenger rather than a fire hunter or fighter. Her physical appearance is that of a young woman with black eyes and black shoulder-length hair, and she is typically seen wearing a kimono.