The Character Connection was across from one of the Innoventions buildings. When we went in mid-January, the characters we saw (all at the same visit) were Mickey, Minnie, Goofy, Pluto, Chip and Dale. I poked my head in later and Donald was there in place of Chip and Dale but the others were the same. We went in the afternoon but I've heard the princesses are sometimes there in the mornings before World Showcase opens.
We had incredible luck with finding characters in Epcot this trip! World Showcase was amazing. We saw Mary Poppins, Belle, Beast, Aurora, Mulan and Mushu, Gepetto, Mr. Smee, Aladdin and Jasmine, Suzy the mouse, Liverlips, Wendell, Big Al, Prince John and Foulfellow (as well as many of the classic characters we had already seen) all in the same afternoon.