The most stable way is to dump the or .cia file from your own Nintendo 3DS.
This guide explains how to get Mii Maker running on your emulator, where to find the necessary files, and how to fix the dreaded "missing faces" bug. What is Mii Maker on Citra? citra mii maker download
Use a tool like GodMode9 to dump the system title for Mii Maker. The most stable way is to dump the or
Some versions of Citra (like Citra MMJ) may require you to enable "Show Home Menu App" in the system settings to see Mii Maker in your game list. 2. Using Mii Data "Fix" Files where to find the necessary files