Of course, as good as Super Mario Land was, it has been said that the team had a distaste for developing games for someone else's character, one whom they had no creative passion for. And so it was that a solution seemed to present itself as they were developing the second-such game, Super Mario Land 2. For within, they were able to create a new character, one of their very own that would "symbolize their situation."
Mario's googly-eyed, pointy-eared opposite proved to be everything he was, only not. Whereas Mario was a little portly, Wario could make the walls shake with his massive girth, and where Mario was strong, Wario was virtually Herculean. Mario's features held a friendly roundness to them, while Wario's were jagged and pointy, from their ears to their noses to their shoes, and even their signature mustaches. While Mario was seen as a kind, helpful, generous soul, Wario was mean, belligerent, and most of all, greedy. And as players would find out upon reaching the end of the final level of Super Mario Land 2, Wario was capable of using all the same powers Mario could, alongside a handful of other sneaky tricks.
In retrospect, one has to wonder if perhaps it was R&D1's distaste of being "forced into developing Mario Land games" that lead to the creation of a character whose very concept owes to being everything Nintendo's mascot was not. One might even speculate that if such resentment were to exist, that Wario might be akin to how the developers had come to view Mario. And if that were indeed the case, then there's little doubt that his creators would have allowed themselves a small chuckle as Wario's popularity took off, allowing him to effectively become to R&D1 what Mario was to Nintendo EAD.