Hinoka is the eldest daughter of Sumeragi and Ikona and the second child of four in the Hoshidan royal family. She originally had another sibling whom she was very much attached to. However, Hinoka lost this sibling when they were kidnapped as a young child and raised in Nohr. Furious at her inability to prevent the kidnapping, Hinoka thereafter began training as a Sky Knight around the age of seven. Her natural inclination to be rash and hotblooded often made training difficult for her, a fact only worsened by pegasi only accepting riders whose hearts are calm and not ruled by passion. As a result, she had trouble training her steed over the years, often running into accidents due to not being able to properly handle it. One of these accidents allowed her to meet Azama, who tended to her injuries and helped her to return home. Forming the impression that Azama was a kind and benevolent monk, Hinoka later hired him to serve as one of her personal retainers.