Super Mario : Luigi Sketches by FrancoisL-Artblog on DeviantArt

Mario and Luigi by USANintendo on DeviantArt

Super Mario - My Nintendo Store - Nintendo Official Site

Déguisement de couple Mario™ et Luigi™ enfants : Deguise-toi, achat de Déguisements couples

THE SUPER MARIO BROS MOVIE Mario & Luigi Superbowl Trailer (NEW 2023)

The official home of Super Mario™ – Characters

Super Mario Bros. Movie includes a Nintendo-approved extended family - Polygon

Luigi rescues Mario (Luigi's Mansion) by PrincessCreation345 on DeviantArt

Mario & Luigi Bowser's Inside Story

Mario & Luigi (series) - Super Mario Wiki, the Mario encyclopedia

I personally really dislike that the movie is making Luigi the damsel in distress. He should be accompanying Mario on his adventure, not waiting for his big brother to rescue him.