Nintendo has added support for two-step authentication on Nintendo Network

We already know that Nintendo has some of the most stable hardware out there and now thanks to the introduction of two-step authentication, now your Nintendo Account can be super-secure, too.
When you opt-in you will be using Google’s 2-Step Verification system. Head over to https://accounts.nintendo.com/security to enable the extra layer of security on your Nintendo Account. You can also change your username / sign-in ID too,
Even though Nintendo’s online service isn’t fully out yet, it’s more than you can do on PlayStation with changing your username.