Ruby Hoshino, is a vibrant girl. With her blonde hair, pink highlights, and ruby-colored eyes, she resembles her late mother Ai Hoshino. Ruby is an extroverted and optimistic idol-in-training who lives life to the fullest. She speaks her mind without filter and enjoys making connections with others. Despite the tragic loss of her mother, Ruby remains determined to fulfill Ai's dreams and is a staunch defender of her mother's secrecy and reputation. She also has a twin brother she calls Aqua.