Nintendo Brother is a term used to refer to the two main characters of the popular Nintendo video game franchise, Mario and Luigi. Mario is the older brother and Luigi is the younger brother. They are both Italian-American plumbers who live in the Mushroom Kingdom and are known for their heroic deeds. Mario is the more famous of the two brothers, often being the protagonist of the games, while Luigi is usually the sidekick. Together, they have starred in numerous games, including the Super Mario Bros. series, Mario Kart, and Mario Party.