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https://www.deviantart.com/nitendofan92/art/The-amazing-Wario-World-1143062169

This is the closest thing you can get to a playable Waluigi in a Wario Land game:

So this drawing of Waluigi drifting his motorcycle referring to Akira drawn by his creator went viral: However someone at Namco also had the same idea a decade early:

https://www.deviantart.com/drawerpunk/art/Waluigi-2024-1133147353

https://www.deviantart.com/drawerpunk/art/Wario-and-Waluigi-Tablet-Sketch-635902333

https://www.deviantart.com/g-norm-us/art/Find-Waluigi-1131763678

https://www.deviantart.com/tjtheredgator/art/Wario-Blender-Wakira-1131147724

https://www.deviantart.com/pikapulu/art/Waluigi-1127668413 https://www.deviantart.com/g-norm-us/art/Waluigi-in-SM64DS-Style-s-UI-852406031

https://bsky.app/profile/bridgeoffaust.bsky.social/post/3la5xzx6m722o

https://www.deviantart.com/icam2k/art/Spring-s-Miracle-914065823 https://www.deviantart.com/icam2k/art/Perched-906873702 https://www.deviantart.com/icam2k/art/The-Close-Purples-859178090

https://www.ebay.com/itm/146075660563 Rare Wario Land merchandise.

https://www.deviantart.com/giu8520/art/super-wario-super-show-1997-1117017218

Well I mean, it is implied that both WarioWare games for the GBA and even the last Metroid games by the R&D apartment use the same engine. I think even the Starfy games, hence Wario's cameo.