Finally, someone has cracked the binary code of the Mii files, allowing us to edit our Miis on the computer!After you edit them (if you have a bluetooth adapter) you can use an application like MiiTransfer or MiiMegaMall to copy those Miis back onto your Wii.

(to preview it, follow these steps:
  1. Edit your Mii in AJ’s Mii Editor and save it.
  2. Head to MiiEditor.com and click on “Mii Editor alpha.” Flash 9 is required.
  3. Once you get in, click on “Load Mii/XML.” A file browser will come up and prompt you for a file.
  4. Choose the .mii file you just saved.
  5. The display will refresh and you will see an approximation of your Mii.)
or
Flash Based Mii Editor:

Completion Status

What is visible:

  • Head shape/color/facial features
  • Hair type/color (no hat color)
  • Eye type/color/position/size/rotation
  • Eyebrow type/color/size/position/rotation
  • Glasses type/size/position (no color)
  • Nose type/size/position
  • Mouth type/size/position (no color)
  • Beard type/color
  • Mustache type/color (no position)
  • Mole (no position/size)

For more Mii technical information, check out the WiiBrew Wiki.