Save it in your wii mote or send it to the other wii by a friend code. I also think you can send them to mii parade and pick them up in the other wii.
Chat with our AI personalities
Click the shadow of a person with the + sign and choose a Mii from your Mii Plaza, you could only have up to eight Mii registered on Wii Fit per Wii.
A Mii is like a personal avatar that you use to represent yourself in some games. In wii sports, the Mii you choose will be the one you play as. In Mario Kart Wii, you can unlock "Mii Driver" which allows you to play as your mii in the races.
You create a Mii then import into Wii Fit. Put in the age when you bring the Mii in and there you have it a baby for the Wii Fit.
You can give you Mii a mask by going to Harriet's place in Animal Crossing. It's free the first time and will cost $3000 bells after that. Any mii that is saved on the wii is able to be used as a mii mask.
Edit your mii and go to the 1st button while you are editing your mii and it will ask if you want the mii to mingle or not. Check mingle, and there ya go.