@tsarstepan,
I do not namedrop Waluigi on almost every thread I post. You think he's "very minor"? I don't think a character that's appearred in 40 Mario games, side games or not, is "very minor".
Super Mario Maker is the
only official Mario franchise platformer Waluigi has appeared in, and it's the only one he's playable in. Waluigi is considered a main Mario character. He is a relatively new character.
Wario, as I said, has been in a few platformers of his own, and there's also the
Wario Ware series. Wario is not as popular or as famous as the Mario Bros. Do you consider Wario to be "very minor"?
I've said to other people Nintendo should have made a game that introduced both Wario and Waluigi at the same time. They
could have made a NES, SNES or Gameboy game that introduced both characters. Apparently Nintendo at the time didn't think Luigi was important enough to warrant getting his own evil doppelganger. Wario predates Waluigi by 8 years. Waluigi was basically an afterthought - Nintendo didn't think if him until they realized Wario needed a partner for a Mario tennis game- a side Mario game. Someone at Camelot proposed the idea for Waluigi when Camelot was helping Nintendo develop
Mario Tennis for the N64 back in 2000 and Nintendo had little to do with his creation. Miyamoto helped the Camelot employee design the character.
Interestingly though, the idea for Waluigi had been around before this. A hypothetical Waluigi appeared in an old '90s manga before Waluigi was officially created by Nintendo:
This makes me wonder why the party behind the manga from 1994 didn't propose the idea for Waluigi to Nintendo back then.