Waluigi - Super Mario Wiki, the Mario encyclopedia
King Boo - Super Mario Wiki, the Mario encyclopedia
Super Mario Wiki
Donkey Kong - Super Mario Wiki, the Mario encyclopedia
Mario Kart: Double Dash!!, MarioWiki
User:Waluigi Time - Super Mario Wiki, the Mario encyclopedia
Roy Koopa - Super Mario Wiki, the Mario encyclopedia
The True Origin of Waluigi - A Super Mario Theory : r/GameTheorists
Super Mario Wiki
Fire Mario, MarioWiki