Here's a very basic one if you want, whipped up in 2 minutes.
Only does characters & gold for now.
Give me results and maybe I'll add more stuff, otherwise we'll just see what gudenaurock has to offer.
Benefits:
No need for Wii Region Changing - Which is highly possible to brick your system if not done correctly
Simplest method of entering East Asian characters to your Mii name.
Tested myself and it does work to transfer to your 3DS and your WiiU
Mii Name Changer (Region Free) [Anarion]...
I get what they were trying to say but what the ad actually says is "we tried to cram a ton of features into the iPad but all of them got irreparably mangled
in the process."