This is a pretty good mod. You might want to move the walk/run sprites down a pixel, since they look like theyre floating. As for the sound effects, l do know a way to fix that. If you copy the sound file (in sound/CharaMario) and rename it to Rosalinas sound file, it will have Peachs sounds.
I make Mystery Mushroom costumes, and can import things to the Wii U for you if needed