The only controllers that you need are the Wii remote, the nunchuk, and a classic controller if you do not have a old gamecube controller. All the other ones you do not need.
No.
Yes, the sensor bar for the Nintendo Wii U is exactly the same as the original Nintendo Wii. Also, Wii remotes, classic controllers and nunchucks work for the Nintendo Wii U. But keep in mind that not all games are compatible with classic controllers
No but you can use Nintendo controllers in Wii
no, but you can use gamecube controllers on the wii.
4
The regular Wii controllers, or you can use the really awkward flat controller that looks like an old super nintendo controller, but with analog sticks.
Yes, they are. Wii remotes, classic controllers, sensor bars and games all work with the Nintendo Wii U. The sensor bar that comes with the Nintendo Wii U is the same as the original Wii sensor bar
Unless you modify the hardware, no.
Nintendo, of course. There are other for unofficial, but I wouldn't recommend them.
The Wii-Remote is wireless only. The wii can also support 4 gamecube controllers, wired or wireless.
There are a number of devices that will make the wii controllers rechargeable. Just go to your local store or search online and you will find some where you just place your wii remote in a holder and it charges when you are not using it.
To play Nintendo GameCube games on ANY Wii console, just insert the disc into the slot. Be sure to have Nintendo GameCube controllers and a memory card if you want to save your games. The slots for the cards and controllers are on the top of the console