Luigi in the new Mario Tennis game. [ Mario Tennis Fever ]

[ Mario Kart World ]

[ Super Mario Party Jamboree – Nintendo Switch 2 Edition + Jamboree TV ]

Luigi's idle animation on the character select screen. [ Mario Kart World ]

Luigi in promotional artwork, alongside Mario, Peach, and Toad.

Luigi loses his balance. Be careful, Luigi! [ Mario & Luigi: Brothership ]

Artwork of Luigi at the Nintendo Tokyo/Osaka stores.

Luigi in some of the game's failed jump attack animations. [ Mario & Luigi: Brothership | Source: しんやまチャンネル ]

Mario and Luigi using their Firebrand and Thunderhand abilities, respectively. [ Mario & Luigi: Superstar Saga + Bowser's Minions ]

A diagram of Luigi, from a 1991 book published by Nintendo Power. [ Mario Mania ]

Artwork of a rather tiny Luigi from the back cover of the Nintendo Space World 2000 Hand Book.

Official art of Luigi with a couple of Goobs. [ Luigi's Mansion 3 ]

A plush of Luigi from the Super Mario All-Star Plush Collection.

Luigi in artwork for amiibo Party. [ Mario Party 10 ]

Luigi in artwork for the Nintendo and Narita Airport collaboration. [ Photo from NintendoSoup ]

[ The Super Mario Bros. Movie ]

A figurine of Luigi, part of a set made for Luigi's Mansion: Dark Moon.

Luigi playing the double bass. [ Nintendo 2020 recruitment booklet ]

Luigi declares that he won't give his name to scoundrels... and then immediately does so by accident. [ Super Paper Mario ]

[ The Super Mario Bros. Movie ]

Luigi’s wanted poster. [ Luigi’s Mansion 3 ]

[ Mario and Sonic at the Olympic Games ]

[ Dance Dance Revolution: Mario Mix ]

??? [ Mario & Luigi: Brothership ]

The different expressions Luigi can make in his passport photo. [ Mario & Luigi: Superstar Saga + Bowser's Minions ]

[ Super Mario Bros. Wonder ]

Luigi in the Japanese and Australian box art of the game. [ Game & Watch Gallery ]

Luigi, as seen in the box art for the game. [ Super Mario All-Stars ]

Luigi taking a look. [ Mario & Luigi: Brothership ]

Luigi's appearance in the GameCube version of NBA Street V3, which featured Mario, Luigi, and Peach as playable characters. [ NBA Street V3 ]

Luigi in an image showing the medallions available at Super Nintendo World.

Artwork of Luigi for Game & Watch Gallery.

A figure of cat Luigi, which could be found in chocolate eggs themed after Super Mario 3D World + Bowser's Fury, made by Furuta.

Some of Luigi's different sprites. [ Paper Mario: The Origami King ]

The Luigi plush from Super Nintendo World.

Luigi's bio, which notes that, "Though normally quiet and unassuming, he's a shrewd and powerful man." [ Fortune Street ]

Luigi's trophy. [ Super Smash Bros. Wii U ]

Luigi in artwork for the Singapore Tour. [ Mario Kart Tour ]

Luigi in the 2004 comic "Mario's Grand Adventure", of which there is only one known chapter. [ Credit to @/ChineseNintendo ]

Luigi, as he appears in a commercial for the game. [ Luigi's Mansion 3 ]

Luigi in the OVA Super Mario Shirayuki-hime. [ Amada Anime Series: Super Mario Bros. ]

Luigi in the Super Mario Chess set, in which he is the queen.

Mario and Luigi celebrating merrily. [ Mario & Luigi: Brothership ]

One of Luigi's victory poses across the Super Smash Bros. series.

Luigi as he appears in the table minigames. [ New Super Mario Bros. ]

Luigi meets Rabbid Luigi. [ Mario + Rabbids Kingdom Battle ]

[ Super Mario Bros. 35th Anniversary visual ]

Images from a 2002 Super Mario Sunshine promotional event by Nintendo of Japan. Despite not being in the game, Luigi is there too. [ Source: @/MarioBrothBlog ]

Luigi, as he appears in the trophy for Peach's Final Smash, Peach Blossom. [ Super Smash Bros. Wii U / 3DS ]

Luigi, as seen in artwork for The Last Spark Hunter. [ Mario + Rabbids Sparks of Hope ]