To put it simply, Mii Parade is a system that uses the network to allow Mii characters created by many people to mix and mingle. You can line up Mii characters in the "Mii Plaza", but at the start the only Mii characters you will find are those you have created yourself. Over time, however, using the WiiConnect24 system, other users' Mii characters can come and visit. In the same way, your Mii can make an appearance on someone else's Wii, although this won't happen unless the user has authorised it.
