I just made a discovery today and I thought I'd share it. (Not actually Knuckles it's a Mii Fighter for Knuckles) I found out how to edit the CSS portraits for the Mii Fighters. You see the CSS portraits for Mii Fighters are stored in extdata. Anyway first you'll need these things. extdata dump and restore tool https://gbatemp.net/threads/3ds-extdata-dump-and-restore-tool-extra-data-editing.378492/ Sm4sh tex viewer/editor https://gbatemp.net/threads/smash-3...c-sfx-voice-clips.414548/page-10#post-6075114 The .txt file in the attachments Also, You'll need access to homebrew. (These custom portraits will only appear on the CSS and will not appear in battle) 1. Put the extdata tool in your 3DS folder on your SD card than boot it on your 3DS and choose dump all extdata to SD card and wait for it to finish. 2. When it's done, turn off your 3DS and take out the SD card put it into your computer, and go to 3ds/extdata_dump/dumps/00000edf/ there should be a folder with a bunch of random numbers and letters, click on it. 3. You should see a texture folder, go into it and you should find a bunch of .tex files. Go through each one with the .tex editor until you find the Mii Fighter Portrait you want to edit. (There are 2 .tex files for each Mii Fighter) 4. Edit away! 5. After you're done editing, put your 2 .tex files in the extdata_dump folder along with config.txt. 6. Open config.txt and change every XX you see to the 2 numbers on your .tex file. (For example if the first .tex file is named mtex_01_00.tex change every XX to 01) 7. Take out your SD card and put it back into your 3DS, then start up the extdata tool again and choose restore extdata specified in config and it should succeed. 8. Go into Smash and see if it worked. Thanks for reading! I'll try my best to anwser any questions and please give any feedback on this tutorial.