Mathias Burrel is a 10th grade student at Kadic Academy. In the episode X.A.N.A.'s Kiss, he's seen kissing, a Polymorphic Clone of Yumi. This gossip was spread to Ulrich. In the episode Music To Soothe the Savage Beast, Odd is asking him for tickets for the Subdigitals, but he had tickets for another music group called Aerosmooth. He was seen talking to William Dunbar in "Fight to the Finish."
Mathias has short black hair and glasses. He wears orange, blue, and green.