General Wario references thread (Now with Index on page 13).

Basically the origin of Dribble and Spitz.

That's what I already thought too half a minute into the video. (I follow Thomas Game Docs too, but I forgot to bring it to discussion here.)

I used to think that it was called Diamond City to make it fit with Wario's desire for money and wealth, but apparently it's named after the fictional company located in the city, which in turn is named after a real-life taxi company.
Wario-like boss in what it seems to be a Goemon's spiritual successor game: