As of now, the Mario character, Waluigi, has never been given his own game (likely due to his origins coming from a 2nd party company called Camelot Software Planning). Since he has never been used, that left it to the fans to use their imagination on the guy. Though, One fangame sticks out a bit more due to it's high quality and polish. This game is called Psycho Waluigi, and regarded as the best Waluigi fangame as it looks like it could've been official, despite it only being made by a group the size close to 10 people.

What I want is to have this fangame to become an official game on the Nintendo switch. Nintendo has a pretty strict policy for fangames, yet somehow this one has stayed up after 7 years on a popular website since it was released, Nintendo has to have noticed it before and they should acknowledge it, because if they (or CSP, if they still have the rights to him which is a bit unknown) buy the game it would be an easy way for them to make money as they wouldn't have to create a game from scratch. Plus it would make the fans, who have wanted Waluigi to have some adventure for years, happy.

Sincerely, Derek