Luigi, Super Mario Bros X Wiki

Super Mario Bros.: Mario Brothers / Characters - TV Tropes

Super Mario Bros X Wiki

Michal The 1993 Nintendo character guide revealed that Mario is of species Homo Nintendonus Since I found that out, I've been haunted by the fact that the Mario wiki refuses to confirm

Luigi, Super X Wiki

Voice actor and cast list - Mario movie

Luigi (SSBM) - SmashWiki, the Super Smash Bros. wiki

Super Mario Wiki (@SMWikiOfficial) / X

Luigi, Video Game Characters Database Wiki

Mario Kart characters guide

Super Mario - Wikipedia

Mario & Luigi: Bowser's Inside Story - Wikipedia