Just a little Teemo theory... (Warning! Sense of humor and sarcasm approaching!)
Teemo is Satan, I'm sure we all agree. Teemo also has a bajillion mushrooms, and it's been said he is the ruler of the mushroom city. And by extension, the Mushroom Kingdom. Thus, Teemo commanded Mario to go after Princess Peach after she was kidnapped by Bowser. But because Teemo is Satan, then is Bowser really the bad guy? If Teemo is Satan, does this mean that the Mushroom Kingdom is Hell/the Underworld? If that's true, then Bowser is really going on a mission to rescue Peach from the clutches of the Underworld. Bowser is now Hercules, and Peach is Persephone. Mario is now an underling of Satan. (or Hades, if you want to go by the mythological story) That is all. (Please no haters)