Her mama is Ai Hoshino, her twin brother is Aquamarine Hoshino, She wants to become a wold famous Idol who makes people happy with their dancing and singing. She choose to be one because of her mama, but Ai passed away because a stalker when Ruby and Aqua were only little kids, however she never gave up on her dream. The twins never knew their father. Her brother is very overprotective about his sister, but he is kind and nice. He wants to be an actor. The twins are both 16 years old.