Many people have been able to store their Miis onto their Wii remote, and have then proceeded to transfer the Mii via Bluetooth to their computers. It’s possible to edit your Mii further this way, and in a way that’s still readable when the Mii is placed back on the Wii.
Realize, though, that the process involves still a lot of technical file editing, so make sure you’re confident you know what you’re doing before attempting. Hit the link below for more information.
Thanks to Brian C. for the tip!
LiquidIce Wii Hacks


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