Is it possible to extensively hack mii's I've seen some hacks but they don't lend much in the way of creativity, what would be nice is make it possible to add new parts for mii creation, such as new hairstyles etc. The only problem I can think of other than actually making this hack possible is that the new mii parts would only show on the wii console installed on.
The problem is that the Mii rendering code is built into each game that uses it. So even if you could hack, for example, the Mii Channel to have extra features, these features wouldn't show up in any games unless the games were hacked too, which is unlikely.
