Wii U will be Nintendo’s first console that uses an account system. Up to 12 user accounts can be made on a Wii U. According to Reggie Fils-Aime, Miis are crucial to Wii U’s account system. Family members who use the same Wii U can make their own Mii, and each Mii will represent the account of the person who created it.
This is similar to the way Miis are used in some Wii games – like Wii Sports – but for Wii U, Miis will play an even bigger role because not only will they appear in games, they will be a major part of the “strong account system” of Nintendo’s upcoming console.
“We recognized that the Wii U had to have a strong account system.”
“Here’s a little bit of background. Up until the Wii U, the device held all of the account information. Whether you played or your kids played or your partner played, it was all one set of data to the Wii. The same was true for DS and 3DS.”
“With Wii U, we’re going to have an account system. This means you’re going to create a Mii, as will all the other members of your family, and the behaviour for each Mii is going to be captured in an account. For example, if you’ve achieved a certain level in a game, that information will be unique to your Mii. Parental settings will be specific to each Mii.”
“This is critically important, because it means things like messaging and achievements and other key online functionality is tailored to you.”