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Wikipedia says…

Luigi (ルイージ, Ruīji^?) is a video game character created by Nintendo's game designer Shigeru Miyamoto. He is portrayed as the younger brother of Nintendo's official mascot, Mario. Luigi first appeared in the arcade game Mario Bros., where he was featured as a main character alongside Mario. Since his debut, Luigi has appeared in many games in the Mario series, often accompanying Mario as the central protagonist, but has starred as the main character of his own game, Luigi's Mansion. In most games of the main series, Luigi is playable, occasionally as a secret revealed in-game or an unlockable.