When did Luigi become such a scaredy cat? - Polygon

Super Mario 64 Bloopers: A Lost Luigi, The SMG4/GLITCH Wiki

Luigi's Mansion 3, Ultimate Pop Culture Wiki

A Short History of Luigi - Feature

Flutter Jump - Super Mario Wiki, the Mario encyclopedia

Mario Googles Himself, The SMG4/GLITCH Wiki

Luigi becoming scared - Mr.Incredible meme by JohnmakerX on DeviantArt

SMG4: Stupid Luigi's Mansion, The SMG4/GLITCH Wiki

Luigi's Evolution: From Palette Swap to Ghostbuster - Nintendo Supply

SMG4: Every Luigi Is Personalized, The SMG4/GLITCH Wiki

Was Luigi ever known to have a scared/timid personality prior to Luigi's Mansion? : r/nintendo

Luigi, Videogaming Wiki

Scaredy Cats! Luigi's Mansion 3