You can on a few games, like Mario Kart. Theirs usually a button at the top orbottom. Most games don't let you use a mii.
You can only play wii games, and game cube games on a wii, unless you have the wii shop channel or the hombrew channel, then you can play others like nes, snes, Nintendo 64, Nintendo ds, ect.
Yes, you can play as a Mii in Mario and Sonic at the Winter Olympic Games. First of all, you should have already made some Miis in the Mii channel. Then, when you're selecting characters during an event, you can change it from Mario and Sonic characters to Miis by clicking on one of the tabs (I've momentarily forgetten what the tab looks like and where it is). This will allow you to play as any of your Miis. Don't delete your Miis from the Mii Channel or your Mii will be deleted from Mario and Sonic at the Winter Olympic Games.
No. Miis are only for wii games like wii sports and wii play.
Go to the wii shop channel and you can buy them to play on your wii.
You can't play demos of Wii games, but you can play demos of DS games if you have a DS. They can be downloaded from the Nintendo channel.
You download them off the Wii shop channel, which lets you play them on the Virtual Console.
no but you can play Nintendo advance games on a Nintendo ds
No. The Nintendo channel on the Wii can via DS download play, but It's only demos.
no but you can play gamecube games on it
Yes you can play Nintendo DS games on a Nintendo ds lite.
The Nintendo 64 does not play Super Nintendo games as they have different cartridge types.
The NES cannot play Nintendo 3DS games. (Obviously)