Luigi is a fictional character featured in video games and related media released by Nintendo. Created by prominent game designer Shigeru Miyamoto, Luigi is portrayed as the slightly younger but taller fraternal twin brother of Nintendo's mascot Mario, and appears in many games throughout the Mario franchise, often as a sidekick to his older brother.
It's like Best and Worst of Villains, but for fictional heroes.
BTW, if anyone copies this (which might be likely since I've seen a few duplicate casts in categories like this one), this is the original.
