Pepsi

Pepsi is Mario's, SMG4's, Luigi's, and Toad's baby and is the main antagonist in one of SMG4's bloopers: The babysitters. He was brought to the Mushroom Kingdom inside a box, however, is evil for just a baby, he is often seen with evil eyes, he turned into a demonic person afterwards when trying to get Bowser's army, he was killed by Luigi with just a single punch, he then burns up and dies.