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https://www.deviantart.com/fromitalywithfurore/art/Wan-Hibigi-Waluigi-X-Dan-Hibiki-Fusion-1315329205

https://www.deviantart.com/coldcolor900/art/Wah-869132279

https://www.deviantart.com/nickishmicki/art/In-Light-of-Recent-Events-1314671187

https://www.deviantart.com/jumpnanza/art/Spike-Swings-Back-1313431651

https://www.deviantart.com/shenvalor/art/Very-Brutish-Wario-1313565464

The first ever arcade game that brought Wario? https://www.mariowiki.com/Wario_Busters

It seems they got one of the actors who voiced Boyacky from Yatterman just to voice Waluigi for a Mario Tennis 64 promo:

https://www.deviantart.com/mollyanne2013/art/Mario-and-wario-1308417264

A scan of the Japanese manual of SMW alluding to the joke that everyone including their grannies know about: "Mario is a drug addict". However the scan came out like this: Mario and Luigi were supposed to be wearing their respective red and green colors, know we know why Wario and Waluigi's got...

https://www.deviantart.com/twarioart/art/Wario-s-Dragon-Fury-Virtual-Boy-Wario-Land-1306249313#image-1 https://www.deviantart.com/twarioart/art/Rice-Beach-1046139359

https://www.deviantart.com/iyzeekiil/art/Wario-redraw-860016514

https://www.deviantart.com/roboguineapigultra/art/Wario-is-drunk-993457415 https://www.deviantart.com/bootscootinboogie/art/look-guys-look-849727420 https://www.deviantart.com/bootscootinboogie/art/Nintendo-please-make-a-new-Wario-Land-game-please-852134343

https://www.deviantart.com/thechimpwhoponders/art/This-is-where-I-watched-my-parents-die-Wario-1303218901

This will be Waluigi in 2014: https://www.deviantart.com/edgardaloquendo/art/Waluigi-Render-Mario-Movie-Style-1303197053

https://www.deviantart.com/spinoskingdom875/art/The-Flaming-Wario-Bros-1302888558

This will be Wario in 2014: https://www.deviantart.com/edgardaloquendo/art/Wario-Render-Mario-Movie-Style-1302775833