The controller stores your Mii data, right? Well, I was wondering, what if a friend of you drops by and plays with your controller and makes a Mii. Then, another friend drops by and uses that same controller. Can you make multiple Miis and save them on one controller or can you only make one of them for just one controller?
Also, can Miis travel accross the internet and end up on your Wii? So for example, any NWR member may end up appearing on my Wii?