1) You cannot officially get more memory for the wii however if you are struggling and need somewhere to store save data you could use the SD card. Basically copy your data on sd card and delete off the system for more room and when you need to play the game again just put that data back on the system. This is complicated due to lots of switching and shuffling every time your turn on a wii however it can be accomplished.Originally Posted by ref1mind
2) You cannot get extra 'special' Mii accessories but this is where the Mii Voting Channel shines, the Miis you see on it have been made by the same pieces as you have. The Creators improvise with the pieces and work hard at making the Mii as best as they can with what they have and some results are excellent. You just have to learn the ways of the Mii to be able to improvise as some of the excellent Mii Artisans do.