Miitomo is ceasing service on May 9. Since your Nintendo Account can feature a Mii created by Miitomo, some have wondered how you’ll be able to change it in the future without the app. It turns out that Nintendo is going to allow you to customize Mii characters via a web browser. This service should arrive by the end of this month.
If you link a Nintendo Account to Miitomo, you will be able to use your Miitomo Mii characters on your Nintendo Account. We will also provide the following option to create and edit Mii characters after Miitomo service has ended.
With the end of Miitomo service, it will no longer be possible to create or edit Mii characters using Miitomo, but we are planning to add a feature in late May 2018 which will enable you to create and edit Mii characters for your Nintendo Account via your web browser of choice.
In order to add this feature, we will be performing system migration maintenance from the end of Miitomo service until late May 2018. During this period, you will not be able to change your Mii character set to your Nintendo Account (including clothes and accessories).
Additionally, changes made to the Mii character for your Nintendo Network ID will not be applied to your Nintendo Account Mii character.