This is a classic graphic rendering glitch. Ensure that your graphics card drivers are updated, and try toggling Hardware Shader or changing the emulation backend from OpenGL to Vulkan (available in modern Citra forks) in the Emulation > Configure > Graphics menu.
The Mii Maker ROM is not merely a cosmetic tool; it is a system application required to generate the CFL_DB.dat database file. Without this file, several high-profile titles—such as Tomodachi Life , Mario Kart 7 , and Super Smash Bros. for 3DS —may fail to launch or experience "box face" glitches where character features do not render correctly. Portability and Accessibility
The original 3DS allowed players to save Miis as QR codes. Portable Citra supports this feature: citra mii maker portable
Citra Mii Maker Portable refers to a self-contained setup of the Nintendo 3DS Mii Maker system application that can run on any computer directly from a USB drive or local folder without installation.
As the original TechBloat guide on this topic emphasizes: "Keep in mind that manipulating game files or using homebrew can sometimes be legally sensitive; ensure you own the game or software you are modifying and adhere to local laws". This is a classic graphic rendering glitch
If a 3DS game requests Mii data and finds an empty virtual NAND, it will trigger one of two responses:
Launch the emulator. Because the empty user directory exists in the root folder, the software recognizes the portable command. It will automatically generate all necessary system folders, configuration profiles, and save directories directly inside that user folder instead of your default operating system app data. Launching and Using Mii Maker Portably Portable Citra supports this feature: Citra Mii Maker
Open your newly created Citra Portable folder (where citra-qt.exe is located). Create a new, empty folder inside this directory. Name this empty folder exactly user .