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Taken from Wiinewz
This requires a PC with Bluetooth capability and, preferably, the Microsoft Bluetooth Stack. If your Bluetooth adapter does not use the MS stack, you may try to change the driver. Open Device Manager and goto your Bluetooth adapter. Right click and select Properties. Click on the Driver tab and choose Update Driver. Select the "Install from a list" option then choose "Do Not Search...I Will Choose a Driver To Install". Uncheck the "Show Compatible Hardware" box and find the Microsoft Bluetooth Stack in the list of drivers. Select it and press Next until it has finished installing. You may need to reboot your PC to complete the installation.
If your Bluetooth adapter is correctly installed, you will have a Bluetooth icon in your taskbar tray. Open the application or (in some cases) right click and select the Bluetooth Connection Wizard. Select Search For Bluetooth Devices or Add A Device depending on your software.
Press the 1 & 2 buttons on your Wiimote. The blue lights on your controller should start to blink. Once the Bluetooth software has detected your controller, continue to install it. If prompted for a passcode, press [i]Skip[/b] or select Do Not Use a Passcode With This Device. You may need to press 1 & 2 on the controller again to complete the synchronization.
Your Wiimote should now be connected to your PC via Bluetooth!
Download the latest version of WDML - MiiTransfer from HERE and install it. These are command-line tools for Wiimote <> PC transfer. There is a GUI available HERE.
Read the included instructions to transfer mii files <> PC

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yeah you can with a Mii editor.

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Thats what I wanna know, I wanna customize my Mii's

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just google "Mii Editor"

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