Hikaru Hoshikawa is one of the main characters in Houkago no Pleiades. She is a bright, energetic middle school girl who becomes involved with the Subaru group’s magical adventures after meeting them. Hikaru serves as a central emotional presence in the story, often acting as the most open and enthusiastic member of the cast. Her curiosity, kindness, and courage help drive the group’s journey as they work together to collect engine fragments and support one another.