Yadina Riddle (voiced by Zoe Hatz) is Xavier's younger sister. She seems to be eager to explore the secret museum and learn about various historical figures. She carries a stuffed turtle around with her named Dr. Zoom. She is quite talented, whether it be with books or with balls. Although Yadina is very extroverted (not a wallflower at all), she is only seven years old. This means that she can be very honest with just about anyone, and sometimes even blunt. For example, Yadina dislikes bees