If you want to make Mii's on your computer:
http://www.maxconsole.net/?mode=news&newsid=15673
Datel's Mii Manager for PC
Datel are set to release some Mii Manager software that allowsd you to edit Mii's on the PC. It doesn't offer any extra functionality over the Wii's Mii editor. It includes a bluetooth receiver and the software application as part of a package for $19.99.
My Mii Manager
Our powerful Mii Manager software lets you edit your Mii for your PC. Its a doddle to use. Just import your Mii into the editor, then edit it until your hearts content. You can even share your Mii with Wii gamers from all over the world over the internet!
My Mii Manager has everything you need. Theres the powerful Mii Manager software application for your PC, and a USB Bluetooth receiver to let you use your Wii-mote with your computer.
http://www.maxconsole.net/?mode=news&newsid=15673