dry bones
unlocked by completing the haunted hotel or whatever that one is and completing it all without losing a life (5 times). he has twice as much health, can jump as high as mario's yoshi, can jump twice as high with yoshi, his yoshi can survive in water, can create levels/nozles/places/new place for after you complete the game, can swim in lava,rocket you can fly around with, can move twice as fast with the fan or something, can go twice as fast as mario, once unlocked you can play online multiplayer, but after each time he loses a health he falls and comes back together.