Xavier Riddle

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

In The Neptunians (series), he and his friends Yadina, Brad, Berby, and Dr. Zoom are the resident Time Travelers, who use their time travel powers to defeat evil.

Appearance
Xavier is a young boy with light brown 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.

Personality
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.

Powers

 * Time Traveling: With the help of Berby, he and his friends can travel back in time to meet famous historical heroes.
 * The Translator: He can translate foreign languages to English using the dial on his hoodie.

Trivia

 * 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.