I have three profiles that I wanted to switch to Pretendo, but it would make a mess adding three more profiles to the main screen, and manually transfering every single save file would take way too much time. Then I saw this thread in Reddit, which says that you need to email or call Nintendo to remove the Nintendo Network ID, but idk if they even give support to the Wii U anymore. But after that I discovered the Wii U Account Swap app, but idk how safe it is because I've never seen any video or thread talking about it, so I'd like to know if it can brick the Wii U or something similar. Thanks in advance! 
