Mii Studio has finally launched and you can access it in your web browser of choice whether that be Google Chrome, FireFox, Safari, Edge etc.
About Mii Studio
The Mii Studio is, as the name implies, a means of creating a Mii character on your computer or tablet. The usual range of customisation is available, so you can tweak your Mii as much as you like.
Many had assumed that the writing was on the wall for Miis when Miiverse was discontinued. While they have had limited use on the Nintendo Switch so far, games like Mario Kart 8 Deluxe supports Miis, and the upcoming Go Vacation will make a big deal of Miis as well.
With this in mind, it seems like high-time for Nintendo to give us a tool so we can create new Miis from the comfort of our own desktop computers.
You can visit the site here; https://accounts.nintendo.com/mii_studio