CustomizeMii is a 100% legal custom Channel creator for the Wii.

Changes:

Fixed writing/reading of channel titles, so japanese characters will work now
Added checkbox (Options tab) to turn security checks off
Added built-in forwarder creator (Needs the ForwardMii.dll which is separately avaiable)
You can choose MP3 files as channel sound (Needs lame.exe in application directory)
Bugfixes

http://wiibrew.org/wiki/CustomizeMii