Matthew "Matt" McGuire, played by Jake Thomas: Matt is Lizzie's younger brother. As a stock character, he is often destroying something. He has a best friend named Lanny, who does not speak on-screen. Matt is clever and wily, and has a reputation for getting into trouble. Matt and Lizzie share a typical brother-sister relationship. They fool around, annoy each other, but are always there for each other at the end of each episode.