Thanks for your comment @digitalengineer, You're right about the first level for Mario and Bowser, One is the guenuine, innocent hero while the second is clearly evil. Also you can easily relate the story to the Round Table or King Arthur kind of, where the knight saves the princess from the dragon. And you can see that everywhere. Like in the marvel movies where designs are really informative (Thor vs his brother Loki is really, really obvious).

Thanks again for your time ! cheers !