Ruby Hoshino is a central character in the anime series 'Oshi no Ko'. She is the daughter of the famous idol Ai Hoshino and is known for her determination to follow in her mother's footsteps to become an idol herself. Ruby is a lively and passionate young girl who has been deeply affected by her mother's tragic past. Her journey is marked by her struggles and perseverance to succeed in the entertainment industry, while uncovering the truths behind her family's history. Ruby's character embodies both youthful optimism and resilience, making her an inspiring figure in the series.