A QR Code is a code that can be scanned on the Mii Maker with the Nintendo 3DS camera. In Tomodachi Life, you can create a QR Code, that has all of the islander's info on it. Except for their birth year. Scanning a Tomodachi Life QR code comes with their outfit and apartment all set up, but you can still change as you please. If you scan a Tomodachi Life QR Code on Mii Maker, then just the Mii, and the Nickname will appear.