Is Wario the shady, unlicensed plumber who does subpar work for a low price?
No, he is the wealthy capitalist who owns all the plumbing companies whether cheap or expensive with the same equipment, giving customers an illusion of choice while also running illegal mines.
Wario creates video games as well. If you think about it, he made the Warioware games.
My favorite Mario character is Wario. I adore his games, and the whole villainy is amusing. 
I feel like Wario World was released quite a while after Mario & Wario, but Wario’s first game was Super Mario Land 2.
You are done! I simply can’t pronounce the names of the franchises. The Wario Ware games are my favorite, but the others never really resonated for me, and I can’t even remember their titles. 