Mii charcters are of course the little people you create on the Nintendo Wii console. The resemblance is uncanny, but I reckon they should have made him smile instead of that rather angered expression he's currently pulling!
From die Homepage der Familie Rudolph :).
Below are some photos of the real guy for your comparative convenience if you knowledge of said person is lacking. You can also visit his official site or visit his Wikipedia article. Comparative convenience?
Danke schön, gute Nacht!