Okay, I'll try. Early in the morning, I have seen characters out in the front of the park; they had taken a bus. It was a pretty random assortment. I understand the bus still makes the rounds in World Showcase but I don't know how you'd find out where it was going.
In front of Mission: Space, I have seen Goofy and Mickey, both in silver capes. They also had the longest line for characters I have seen at Epcot.
At the Living Seas, there's a very cute Nemo. It's not really a character, since I don't think it talks and it's on wheels (this thing is very hard to describe), but my DD always looks for it.
At UK, in the toy shop, we met characters from Pooh. I understand that sometimes Mary Poppins characters meet there as well.
At Morocco, go toward the back (where the Restaurant Marrakesh is). There's a room back there and also space in the open for characters from Aladdin. We have met Jasmine, Aladdin and the Genie.
France: I have been told Beauty and the Beast characters are here.
Norway: Has changed the format of the main restaurant so now there are princesses in the restaurant. I don't know who is there after breakfast though.
I should also point out that World Showcase generally doesn't open until 11. So, I'm not sure you'll be able to find characters so much in the morning. My kids love the Land pavillion though, and they could easily spend a couple of hours there and at Living Seas until WS opens.
I hope they enjoy themselves--and you do too!