Yadina Riddle is an artist, the deuteragonist of Xavier Riddle and the Secret Museum, and is Xavier's younger sister.[2] She is six years old and is initially in kindergarten,[3] 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.

According to Brad Meltzer, she wants to be president when she grows up. This is supported by her saying as much in I Am George Washington and I Am Theodore Roosevelt. Also in I Am Eleanor Roosevelt she refers to the white house as "my future home: I plan to be president and this is where the president lives"

This focus on attaining the presidency manifests in We Are the Bronte Sisters with Yadina dressing up as Wonder President. Her interest in cosplay is built upon later in that episode with her acting as Ring Master.

The I Am Madam President special scheduled for March 2020 was announced with a picture indicating she would run in the year 2056.


Yadina Riddle - Concept Art
  • 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.



  1. 30 August 2019 article on 9story: "Meet Xavier’s confident and adventurous younger sister, Yadina. Although Yadina is very extroverted (not a wallflower at all), she is only six-years-old."
  2. in I Am Harry Houdini, Yadina says "goodnight big brother" to Xavier
  3. In I Am Alexander Hamilton she ponders "I wonder if Alexander Hamilton can help me stay in kindergarten forever."
  4. "Xavier is based on my youngest son, who is also a dreamer and his head is always in the clouds, but he can’t tie his own shoes. His sister Yadina is just like my own daughter, and Brad — well, he is the most handsome character, so he’s just like me,” jokes Meltzer."
ved Characters
BerbyBrad Meltzer (character)Dr. ZoomXavier RiddleYadina Riddle
Historical Figures
Johann Sebastian BachMarie CurieMary ShelleyHarry HoudiniHelen KellerAlexander Graham BellFlorence NightingaleGeorge Washington CarverLeonardo da VinciAmelia EarhartIsaac NewtonGolda MeirWinston ChurchillCleopatraCatherine the GreatTomioka TessaiGeorge WashingtonSusan B. AnthonyZora Neale HurstonCharles DickensWright BrothersBronte SistersMark TwainAbigail AdamsJulia ChildNeil ArmstrongJackie RobinsonAnna PavlovaMary LeakeyAlexander HamiltonTheodore RooseveltEleanor RooseveltLou GehrigMarie OwensJackie Joyner-KerseeSally RideJunko TabeiNikola TeslaNellie BlyMaya AngelouFrederick DouglassLouis PasteurRachel CarsonKate WarneSir Arthur Conan DoyleCesar ChavezDolores HuertaConfuciusSacagaweaMary AnningCharlie ChaplinBillie Jean KingArthur AsheRosa ParksThurgood MarshallHarriet Tubman

Abraham LincolnAlbert Einstein

Minor Characters
Little GirlButterfly Club LeaderOlder GirlFearless JeanMurrayAnne SullivanBelleHelen's special teacherΠPoppyBell's MotherHelen's escortGeorge (I Am Alexander Graham Bell)Next Door NeighborFlo's petFlo's neighbor's dogBasketballerRobotterMonaAmelia's momAmelia's teacherGolda's MomTrike KidTurtlePark RangerReginaJinCharlieBenjamin and TheodorePhillipKing PtolemyCleo's catRiddles' momRiddles' dadRiddles' grandmaMatthiasBrad's dadBrad's granddadBrad's great-granddadRiddles' mom's momTomioka's FatherYadina's great grandmaLawrenceDaniel Read AnthonyGuelma Penn AnthonyGertieYoung ManOld ManJulia's GrandmotherMallie RobinsonSarahBrianKid in a green coatSarah's dadBrendan ConnollyGirl (I Am Marie Owens)TylerBoy 1LionQueen of ClubsJohn AdamsAnna's teacherJack PavlovaXavier and Yadina's great great grandmother
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