Even though this character has already enjoyed getting a lot of appearances in games, I still feel grateful whenever Waluigi gets to appear in a new game. It's also fortunate that he appeared early enough that he's a guaranteed inclusion in the roster, such as in the Mario & Sonic games and the Mario Party games. Some cases like Mario Kart 7 was unfortunate though.
My reasoning is due to how unique of a status Waluigi is. He's never appeared in a Super Mario (main series) game, but he's appeared far more often than a lot of characters that first appeared in Super Mario, so much so that he could feasibly stand beside the other main Mario characters. Moreover, spin-offs aren't inherently something to dismiss because they are complimentary, not derogatory to the main series. Unlike most of the characters that regularly appear in spin-offs, Waluigi gets to be something a lot of characters don't get a chance to be: playable. Yes, being playable improves the appeal of the character especially if the video game is fun, which is the case for most Mario games.
I suppose it's true when they say that Waluigi is hardworking: he may not have the privileges that many characters have (appears in Super Mario), nor does he appear in a game that is treated with importance (RPGs, character-focused series like Yoshi and Wario, and Super Mario), but he still has frequent playable appearances where he shows his character (here's where the "hardworking" part comes in) and I felt that it payed of.
Seeing how Waluigi gets a lot of push back when it comes to Wario and being playable in Smash only made my case clear. Sure there are people who didn't like Waluigi as to enjoy his exclusion, but at the same time the existence of detractors means that the appeal of the character is large enough to have them, as evidenced by those who actually like the character! It's unfortunate that there are quite a few people who were verbally uncool with Waluigi's unplayability in Smash, which I was disappointed with because it provided detractors ammunition to strengthen their case. Similarly there's Daisy who get a lot of dislike, but still, I do not wish for that to happen to other people's favourites like Rosalina, Geno or Fawful.
It's a bizarre thing for me to mention, maybe even lampoonable, but I just have to get it out there.
So I was recording something a couple weeks ago and for some reason it bothered me that my capture card wasn't recording at exactly 30 FPS, only 29.971. I wouldn't call myself a framerate snob most of the time but I just needed that extra .029 FPS.