I don't believe ideas are anywhere near as important as execution, but with Super Mario Maker the ideas ... continued to support the game, adding free surprises, character options and features ...
When the developer Acquire first began exploring character designs for the game, it wanted to do something entirely new. That included making Mario and Luigi looked 'edgier' and more 'rugged'.
Created by Shigeru Miyamoto while he was developing Donkey Kong (which, incidentally, was supposed to be a game based on Popeye), Mario was ... at the time was to create a character as popular ...