If you're a bit attached to your own Mii, this Nintendo Wii homebrew application from (yet again) coder waninkoko is particularly for you. Mii Extractor version 1.0 lets you extract all the Mii avatars from your Wii to an SD card.

This is another simple-to-use homebrew in the likeness of dev waninkoko's Wii Duplicated Channel Remover version 2.1 a few days back. All you have to do is simply run the application and the homebrew will do all the transferring work for you. All Miis will be copied to the "miis" directory.

Dev waninkoko credits fellow coders bushing and marcan for the assistance. Although Mii Extractor version 1.0 is easy to use, make sure to check the readme first before using this with your Nintendo Wii.