These are probably the closest thing we'll get to Mario legos. Made by the K'nex company, they are more authentic than my customs.
Boswer is the same size as Mario, which I don't like. In the video games, Bowser is much larger than Mario.
They fit on lego platforms and can grasp lego objects, which is quite nice. They are taller than minifigs, though.
And of course,their karts, which have a motor.