Hikari Minowa is a student of Starlight Academy, where she is a popular net idol who performs almost exclusively online. Her physical appearance includes medium-length violet hair often styled into two semi-twin tails with pink bows, and her eyes are a shade of rouge or maroon. She has a calm and collected personality, often presenting a cool demeanor. Despite making flashy entrances, she is genuinely humble about her popularity and is deeply serious about her work as an idol. Her dedication to her craft leads her to train extensively in solitude, frequently hiding away so she can focus entirely on her performances without being seen, as she wishes her only public appearances to be for her fans, whom she adores above all else.

Her role in the story is that of a minor but notable rival to the main character Ran Shibuki. She is known for rarely attending classes or appearing in official public settings, instead spending most of her time in an underground studio at the school for her internet broadcasts. This unique behavior has earned her the nickname the Underground Sun. Her designated coordinator, Johnny Bepp, often welcomes her with the word Flash. One of her key relationships is with her rival, Ran Shibuki; in their first on-screen confrontation, Hikari used a regular card while Ran used a rare card, suggesting a high level of skill despite the outcome.

Regarding her development, Hikari is a very private individual who prefers to let her online activities speak for themselves. She is a third-year high school student with a birthday of March 28 and blood type AB. Her type as an idol is Sexy, and her preferred brand for coordinates is Spicy Ageha, a brand also favored by her rival, Ran Shibuki. Her notable abilities include being a powerful and serious performer who trains alone to maintain her high standards. She was also selected as a mascot character for the franchise's official shop, and a debut solo CD has been announced for her character.