Luigi, Super Mario Bros X Wiki

Luigi - Super Mario Wiki, the Mario encyclopedia

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

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Mr. L - Super Mario Wiki, the Mario encyclopedia

How to Get Luigi on New Super Mario Bros. DS: 13 Steps

MARIO AND SPLATOON CROSSOVER CONFIRMED?!?! : r/casualnintendo

Luigi, Super Mario Bros: Heroes of the Stars Wiki

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

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