How can I change my Mii?
To change the Mii you're using for your account, visit this page and click on "Change Mii" below your current Mii icon.
On the next page, you can choose which Mii to use for your account. Click on a Mii to set, edit or delete that Mii.
You can also create a Mii from scratch here. Click on the + icon to create a new Mii.
You can save up to six different Mii characters here, which you can choose from at any time. If you want to create another Mii on top of those six, you'll have to delete one first.