Mii Channel

A Mii (ミー Mī) is a digital avatar used in the Nintendo Wii gaming console. They allow users to capture a likeness (or a caricature) of themselves and others. After creating one using the Wii's Mii Channel, they can be used as characters in Mii-oriented games such as Wii Sports, Wii Sports Resort, Wii Fit, Wii Fit Plus, Wii Play, Mario & Sonic at the Olympic Games, Mario Kart Wii and other titles.

Wii consoles can store up to 100 Miis, up to 10 of which can be favorites. The Wii Remote itself can hold up to 10 Miis on its internal memory, which can later be transferred to another Wii console. However, they can only be edited on the console on which they were created. In addition, Miis can also be exchanged via the WiiConnect24 service, whereby allowing a player's Miis to "mingle" will enable such Miis to appear on other people's Wii consoles.

Emulation Information
The Mii Channel supports transferring Miis to certain DS games, and to Nintendo 3DS' Mii Maker, although this feature is hidden by default (it can be activated by pressing A, then B , then 1 , and then holding 2 . (Source))

Copy Miis between Dolphin↔Wii or Dolphin↔Dolphin
Transferring Miis works only with real Wii Remotes. The time it takes to read/write the Miis on the Wii Remote can greatly vary depending of the Bluetooth adapter and stack used. Transferring Miis between Dolphin and physical Wiis is very easy this way.

Copy Miis from Dolphin to Nintendo 3DS, Wii U, and/or Nintendo Switch
Transferring Dolphin Miis to later consoles is not so easy, due to Wii U's vWii Mii Channel lacking the import function (See the Differing Mii Channel versions (…) section below), and Dolphin not being able to send data (including Miis) to Nintendo 3DS or Nintendo DS. It's not impossible, however.

Once a Mii has been copied to a physical Wii, the official methods for transferring Miis to Nintendo 3DS or Wii U, and onwards to Nintendo Switch, apply.

Alternately, Savegame Manager GX on both Dolphin and a softmodded Wii U, can be used to export and import .miigx files between each other. After importing the .miigx file into the Wii U vWii, the Wii U Mii Maker can select "Import from Wii Menu".

Problems
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Corrupted Mii Faces
The Mii Faces will miss some of their properties if Texture Cache Accuracy is not set to Safe. To fix, set it to Safe. Setting it to Medium also works, but the channel has to be reset once after it has started. Fixed by

White Floor
The floor where the Miis walk is completely white. Disable Fast Depth Calculation to fix this. This is no longer needed. Works also with Fast Depth Calculation enabled.

For Mii Channel, this primarily affects the Wii Friends option on the right bar.

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HD Texture Pack
Mii Channel + Miis 4K Resource Pack by Rusty Potato