ttio.dldi is created/extracted by yasu?ttio_2.dldi is extracted by OSW from a TTDS bootloader dump.both appear to work fine but one is slightly smaller.proper testing might reveal more.
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)