My little sister wanted a new skin and i was hungry while thinking of an idea. Here is the result. (its much more healthy for your ds than those fast food skins)please download and commentveiw disscusion on my blog
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)