Xavier Riddle is the titular eponymous protagonist of the series, Xavier Riddle and the Secret Museum, being one of three main human characters: himself, his sister Yadina and their friend Brad.


Xavier is a young boy with tan skin and shiny black hair. He wears grey-blue pants and black sneakers over white socks.

He wears a red hoodie with the hood up, "alien"-style antennae on it, and a black "X". This iconic hoodie contains the translator which allows him (and it seems, also Yadina and Brad, despite not wearing one too) to understand non-English speaking historical figures.



Xavier is the leader of his group with Yadina and Brad. He appears to be an excitable kid who is eager to go back in time and meet various historical figures. He is described as a kid who loves everything (especially art and basketball), but lives for adventures.


Click here to view the history of Xavier Riddle.


Xavier RIddle - Concept Art
  • In concept art, he was originally white, had brown hair, black pants, a red sweater, and lightning bolts instead of antennae.
  • The "X" on his hoodie stands for Xavier.
  • As of November 2, 2019, he has a different voice on the show's official website. The reason for this is unknown, though in the case of characters voiced by children this usually occurs when the character's voice actor become old enough that their voice deepens.
  • The inspiration for Xavier came from Brad Meltzer's own son.[3]
  • Xavier might have a crush on Sally Ride, as he blushed at her.
  • In the Hebrew dub, he is renamed to Daniel.



  1. ↑ 2 October 2019 tweet by XavierRiddleHQ: "INTRODUCING..... XAVIER! This energetic seven-year-old loves running HEAD FIRST into adventure!"
  2. ↑
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v β€’ e β€’ d Characters
Berby β€’ Brad Meltzer (character) β€’ Dr. Zoom β€’ Xavier Riddle β€’ Yadina Riddle
Historical Figures
Johann Sebastian Bach β€’ Marie Curie β€’ Mary Shelley β€’ Harry Houdini β€’ Helen Keller β€’ Alexander Graham Bell β€’ Florence Nightingale β€’ George Washington Carver β€’ Leonardo da Vinci β€’ Amelia Earhart β€’ Isaac Newton β€’ Golda Meir β€’ Winston Churchill β€’ Cleopatra β€’ Catherine the Great β€’ Tomioka Tessai β€’ George Washington β€’ Susan B. Anthony β€’ Zora Neale Hurston β€’ Charles Dickens β€’ Wright Brothers β€’ Bronte Sisters β€’ Mark Twain β€’ Abigail Adams β€’ Julia Child β€’ Neil Armstrong β€’ Jackie Robinson β€’ Anna Pavlova β€’ Mary Leakey β€’ Alexander Hamilton β€’ Theodore Roosevelt β€’ Eleanor Roosevelt β€’ Lou Gehrig β€’ Marie Owens β€’ Jackie Joyner-Kersee β€’ Sally Ride β€’ Junko Tabei β€’ Nikola Tesla β€’ Nellie Bly β€’ Maya Angelou β€’ Frederick Douglass β€’ Louis Pasteur β€’ Rachel Carson β€’ Kate Warne β€’ Sir Arthur Conan Doyle β€’ Cesar Chavez β€’ Dolores Huerta β€’ Confucius β€’ Sacagawea β€’ Mary Anning β€’ Charlie Chaplin β€’ Billie Jean King β€’ Arthur Ashe β€’ Rosa Parks β€’ Thurgood Marshall β€’ Harriet Tubman

Abraham Lincoln β€’ Albert Einstein

Minor Characters
Little Girl β€’ Butterfly Club Leader β€’ Older Girl β€’ Fearless Jean β€’ Murray β€’ Anne Sullivan β€’ Belle β€’ Helen's special teacher β€’ Ξ  β€’ Poppy β€’ Bell's Mother β€’ Helen's escort β€’ George (I Am Alexander Graham Bell) β€’ Next Door Neighbor β€’ Flo's pet β€’ Flo's neighbor's dog β€’ Basketballer β€’ Robotter β€’ Mona β€’ Amelia's mom β€’ Amelia's teacher β€’ Golda's Mom β€’ Trike Kid β€’ Turtle β€’ Park Ranger β€’ Regina β€’ Jin β€’ Charlie β€’ Benjamin and Theodore β€’ Phillip β€’ King Ptolemy β€’ Cleo's cat β€’ Riddles' mom β€’ Riddles' dad β€’ Riddles' grandma β€’ Matthias β€’ Brad's dad β€’ Brad's granddad β€’ Brad's great-granddad β€’ Riddles' mom's mom β€’ Tomioka's Father β€’ Yadina's great grandma β€’ Lawrence β€’ Daniel Read Anthony β€’ Guelma Penn Anthony β€’ Gertie β€’ Young Man β€’ Old Man β€’ Julia's Grandmother β€’ Mallie Robinson β€’ Sarah β€’ Brian β€’ Kid in a green coat β€’ Sarah's dad β€’ Brendan Connolly β€’ Girl (I Am Marie Owens) β€’ Tyler β€’ Boy 1 β€’ Lion β€’ Queen of Clubs β€’ John Adams β€’ Anna's teacher β€’ Jack Pavlova β€’ Xavier and Yadina's great great grandmother
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