Well, I just wrote to Nintendo to ask what the hell I should do. I'll try real hard to make this simple:
My parents bought a Wii U at launch. I created an NNID on it, but NNIDs are linked to the console. I moved with my boyfriend, we got our own Wii U, I'm stuck and can't access the games I bought on my parents' console. I called customer support last summer and asked for an NNID transfer, they said there would eventually be an application to make transfers easy in the future. I left it at that.
Now, I really want to play the Bravery Default demo with the bonus stuff, and of course use the Pokébank too, but now it's mandatory to have an NNID on the 3DS to download from the e-shop. I would link my existing NNID, but if I can never access it again on Wii U, it would suck if I had different NNIDs on my 3DS and Wii U. But at the same time, I don't really want to create a new NNID (and hence a new username, ugh...), start over all my Miiverse posts, and never have my games again (virtual console only, but still...).
So I just wrote them all this, asking what I should do now. I really hope they will answer soon, and with an answer that will let me keep my old stuff... Let's see how it goes.
From what I know, you've done the right thing so far. It sounds like you haven't made a new NNID on your personal Wii U, so that's good. From what I've seen and read, there is a way to transfer NNIDs between two Wii Us. If they haven't created a transfer utility yet, it looks like you can do a system format on the original Wii U and that'll release the NNID from the original, which you can then use on the new Wii U.
As for the 3DS, you can use the same NNID for Wii U and 3DS no problem. I'm sure others can confirm this as well.
For the transfer, you may want to wait to hear back from Nintendo if you don't feel comfortable with the system format.
I'm sorry to hear about that Karyann. I unfortunately cannot relate because I do not any virtual or digital games. The only problem I have with my Wii U is I cannot register my Wii U system to get Club Nintendo points because I dont have internet and its too much of a hassle to bring this somewhere else to connect and you have to connect to the net directly from the gamepad to create a Nintendo ID to get points. I use my laptop to connect to the net buts its not my internet!
Please keep us updated on the Nintendo issue because I'm kind of curious to the end resolution
I may be wrong about registering the Wii U, but club Nintendo and the NNID are separate things. To register my 3DS, I created a club nintendo account on their website, then input the serial number. I would think the process is the same for adding a Wii U. Then you'd get coins for the system!
The reason you can tie a NNID to your club Nintendo account is so when you buy digital games, they automatically register it for you, thus giving you coins. It's true you can only create a NNID through the Wii U or 3DS, but club Nintendo can be done all online.