Complete Monster/Mario

While a very light-hearted, fun loving kind of series that is known for it's happy and cheery aesthetics, even Mario isn't immune to these guys showing up every now and then.


 * Yes even the Paper Mario series has these. From the second game, there's the Shadow Queen, a savage demonic despot with a lust for power. She  Why she did all this you ask? No reason. Even when she was defeated,
 * Also from the second game is a guy who operated on a much smaller scale than the Shadow Queen but still able to use all resources available to his best advantage,
 * The third game in the series gives us a rather vile example in