Marco Diaz is one of the main protagonists of the Disney's television series Star vs. the Forces of Evil. The best friend of the Mewni princess Star Butterfly, Marco initially showed Star the delights and presents of Earth to accommodate her to her new surroundings. He also appeared to be an expert martial artist, able to thwart nefarious forces when threatened, including Ludo and Toffee. Over the course of his original adventure, Marco fell in love with Star, and by the end he became her new boyfriend after confessing his true feelings towards her. He assists Star in her battles against the villains in the events of the second Disney Heroes vs. Villains and Heroes vs. Villains wars.