It seems you're asking about Citra, the Nintendo 3DS emulator, specifically the "Mii Maker" feature and the concept of a "portable" version.
Do you already have the system files dumped from your own 3DS? citra mii maker portable
FFLAppDat.dat (or CFL_DB.dat depending on region).. This forces Citra to save all Mii data within that folder rather than your Windows Amiibo Support : Once your Mii is created, you can use Citra's Amiibo Emulation It seems you're asking about Citra , the
\YourCitraFolder\user\user, you will see:
Error messages – e.g., "No Mii data found," "Failed to load Mii." The file should be named FFLAppDat
Note: Due to legal restrictions, Citra does not come with these system files. Users must dump them from their own 3DS console.
On Android, dragging CIA files is difficult. Use the Citra Mii Editor APK (a port of the official app):