Luigi first appeared in the 1983 Game & Watch game Mario Bros., where he is the character controlled by the second player. He is portrayed as the younger fraternal twin brother and sidekick of Mario, Nintendo's mascot. He would retain this role in many future games, including Super Mario Bros.
See also: Mario & Luigi, List of Luigi video games, Luigi's Mansion: Dark Moon, Luigi Lucheni, Luigi's Mansion, Mario & Luigi: Bowser's Inside Story,