I mean, the guy's a damn italian plumber that goes around smashing floating bricks with his head and fighting turtles, flying turtles, giant mutant fire-spitting turtles, and literally smashing little weird looking thingies by jumping on them. Sometimes, when he hits his head against a floating brick, it will turn into metal and money will come out of it. If he eats a mushroom, he gets taller and stronger, and if he eats a flower he gains the abality of throwing fire balls that can turn his enemies into money. Sometimes he rides a queer looking sexless dinosaur... Or maybe it's not that it has no sex, maybe it's both things at once... That'd explain all the eggs it leaves behind.
In his free time (when he's not saving the Princess of the Mushroom People from the giant mutant fire-spitting turtle(s) or some chick named Daisy from a giant barrel throwing ape, that is a good guy most of the time, but sometimes goes mental and likes to kidnap women), he likes to play Golf, Tennis or Board Games with his friends and deadly enemies. Sometimes they just like to beat the crap out of each other just for the fun of it. If they are in the mood, they jump into Karts and race each other to death.
Mario is also apparently a Doctor... I'd say one specialized in psychedelic mushrooms and flowers.
