Yadina Riddle is an artist, the deuteragonist of Xavier Riddle and the Secret Museum, and is Xavier's younger sister. She is six years old and is initially in kindergarten, but joins the 1st grade in Season 1.
In the future, she becomes the President of the United States of America.
Yadina is a young girl with tan skin, and shiny black hair that she wears in pigtails, held up by pink hair bands. She wears a light blue T-shirt underneath her pink overalls, which have a black star on them. She wears black sneakers over yellow socks. On both of her wrists, she wears two black bracelets.
Yadina, like her brother, 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. She also has a habit of making terrible puns and then having to explain them, as Xavier and Brad usually have no idea what she's talking about.
Yadina is very extroverted (not a wallflower at all) and can be very honest with just about anyone, and sometimes even blunt! For example, Yadina dislikes meanness of any kind, and she will let anyone who is not being friendly to another, know exactly what she thinks of their behavior. When faced with conflict, Yadina is an expert at making others understand a situation from someone else’s perspective, which ultimately requires empathy, self-awareness and self-regulation.
In concept art (see left) she had a sweater that made the letter "Y".
While travelling back in time (see right) she adopts a cross-legged sitting pose with her hands held out. Her palms are open except for a pinching gesture between her thumb and forefingers. This is known as the Gyana Mudra. It is a gesture of supreme knowledge which is one of the Hasta Mudras (hand gestures) in yoga.
Her motif might be black stars, based on her different outfits.