What is mii?

Mii A Mii (IPA: []) is a digital avatar created by Nintendo for the Wii’s Mii Channel. After creating them, they can be used as participating characters in certain Mii-oriented games, as first shown in Wii Sports and Wii Play. Miis are customizable and allow the user to capture a likeness or caricature, or capture the personality of themselves and others.

source ,,Wikipedia

It’s the look a like character you create on the Wii (game consule. You can choose any miscallaneous thing they have like facial hair, spikey hair, freckles,etc.

on the wii console you make “mii’s” that look like you.

It’s a wii upside down.

Mii is your own personal character you create on Wii. Mii is Spelt differently from Me. Because as the game console is Wii.