We're all waiting for the day when Nintendo finally gives Waluigi his own adventure. I don't know if its ever going to happen, but I can certainly dream. Until then, we have fan-mods like this one to let us swap out Link for Waluigi. I knew he had the heart of a hero deep inside.
This is what amiibo should've given us for the longest time now. I mean you already have goofy costumes, there'd be nothing negative about doing things like this with amiibo.