The Digital Library for Miis
The Mii Library is a site documenting every single Mii to have ever been used in an official capacity, by HEYimHeroic (you also may know me as Wii Facts Plus) using Google Sites. Every Mii will have a face image, a full body image, and a QR code image to be scanned into Mii Maker or other Mii QR code-supporting app. This way, everyone who wishes to have these Miis in their own games or Mii Plazas can.
Along with those three photos mentioned, every Mii's page will have detailed information about the Mii, including the games the Mii appears in, where this Mii is used in the game, and any hidden information found in the Mii data file. Additionally, if a Mii originates from the Wii or the Switch, step-by-step instructions on how to recreate the Mii will be available.
Click a system to get started on viewing Miis from that system, or click the button below it, "All Miis", to view a list of all of the Miis.