Apparently Wario Was Mario's Childhood Friend and Bowser "Could Not Stand the Idea of Happy Fungi" and more info about each characters history

[platformmaster918]

Jizz_Beard_thePirate said:

Well, Mario was a bit of a dick to Wario such as in this comic so I can kinda see him being Jealous

That's...surprisingly funny and gives him some proper motivation.

if only Nintendo put this much effort into the writing and general story of their actual games maybe it wouldn't be their weakest aspect