Things You'll Need
Instructions
Turn on your Nintendo Wii, and wait for the main screen to load. Select the "Mii Channel" by pointing your Wii remote at the screen, making sure the selection hand is over the channel and pressing the "A" button on the Wii remote.
Look for the Mii you want to delete in the Mii Plaza. Once you locate the Mii, use the Wii remote to select the Mii. You can do this by placing the selection hand over the Mii and pressing the "A" and "B" buttons on the Wii remote simultaneously.
Drag the Mii to the "Erase Mii" button that is located underneath the "Create Mii" button. Release the Mii by letting go of both buttons on the Wii remote. You are asked to confirm the deletion of the Mii.
Click the "Mii Parade" button to delete a Mii from that screen. Locate the Mii to delete, and follow the same steps you did for deleting one of your own Miis.