Based on available sources, Kō Hyūga is listed as a character within the series and his voice actor is identified. Official media, including episode summaries, discography details, and plot synopses, does not provide information regarding his background story, character development, personality traits, specific narrative role, relationships, involvement in story arcs, or interactions with other characters. He appears visually in a summer vacation illustration created by the original character designer alongside other characters, but this depiction offers no narrative or background details. Character details beyond his name and presence remain unspecified.